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Fenix E03R V2.0 Keychain Flashlight

$41.00 $29.95

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Color: Gray

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SKU: E03RV2GYN/ABarcode: 6942870309552N/A

Product Overview

Super small and compact, the Fenix E03R V2.0 rechargeable keychain flashlight features upgraded performance with an extremely bright maximum 500 lumens. A single switch operates on/off and seven lighting modes, including four brightness levels, red light, red flashing, and a pulse light. The large battery level indicator lets you know when it's time to recharge the built-in battery via the USB Type-C charging port. This flashlight is built tough because of its all-metal construction and IP66 rating, making it heavy splashproof, and dustproof. Smaller than your key fob, the Fenix E03R V2.0 flashlight will be a welcomed addition to your keychain.


Max Lumens: 500
Max Beam Distance: 295 feet (90 meters)
Max Runtime: 30 hours
Lighting Modes: Seven modes including four brightness levels, red light, red flashing, and pulse light
Bulb Type: Two white light LEDs and one red light LED, with a lifespan of 50,000 hours
Lens Material: Polycarbonate
Color Temperature: 6500K
Size: Length: 2.07” (52.5mm) Width: 1.02” (26mm) Height: 0.51” (13mm)
Weight: 1.06 oz. (30g) including battery
Battery: Built-in 400mAh li-polymer battery
Included: USB Type-C charging cable, key chain
Warranty: Limited Lifetime Guarantee from Fenix Lighting USA

More Information

  • Two white light LEDs and one red light LED, with a lifespan of 50,000 hours.
  • Built-in 400mAh battery.
  • Built-in green/red pulse light.
  • White/red light sources.
  • USB Type-C charging port.
  • Recessed switch and lockout function.
  • Battery level indication and low-voltage warning.
  • Intelligent overheat protection against high surface temperature.
  • All-metal CNC machined body.
  • Premium type HAIII hard-anodized anti-abrasive finish.
Fenix E03R V2.0 Keychain Flashlight specs chart


Fenix E03R V2.0 Keychain Flashlight runtime chart


Press and hold the switch for 0.5 seconds to turn on/off the light.

Press and hold the switch for 1.2 seconds to turn on the red light.

With the light switched off and unlocked, double click the switch to turn on the pulse light, press and hold for 0.5 seconds to turn off.


Output Selection

In white light mode: single click the switch to cycle through Eco→Low→Med→High.

In red light mode: single click the switch to cycle through Red→Red Flash.

With the pulse light turned on, single click the switch to cycle through Red→Green→Red&Green in turn.


Intelligent Memory Circuit

The light memorizes the last selected output in white light mode. When turned on again the previously used output of white light mode will be recalled. 



Lock: with the light switched off, press and hold the switch for 3 seconds to lock the light, the light will blink twice on Eco to indicate locked status.

Unlock: with the light locked, press and hold the switch for 3 seconds, the light will be unlocked and activated on Eco.

In locked status, single clicking will activate battery level indication, and other operations except long pressing will activate 2 blinks on Eco to indicate locked status.



  1. First switch off the light and plug the USB A socket of the charging cable into an electrical outlet, then connect the USB Type-C socket of the charging cable to the light. 
  2. The indicator will display red while charging, and will turn green when fully charged. 
  3. Once charging is completed, be sure to close the anti-dust cover for normal use.
  4. Eco and Red modes are available while charging.

Battery Level Indication 

With the light switched off, single click the switch to check the battery level and it will last for 3 seconds. 

Green light on: saturated 100% - 85%

Green light flashes: sufficient 85% - 50%

Red light on: poor 50% - 25% 

Red light flashes: critical 25% - 1%


Intelligent Overheat Protection            

The light will accumulate a lot of heat when used on High mode for extended periods. When the light reaches a temperature of 60°C or above, the light will automatically step down a few lumens to reduce the temperature. When the temperature drops below 60°C, it will then allow the user the reselection of High mode. 


Low-voltage Warning

When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until Eco mode is reached. When this happens in Eco mode, the battery level indicator blinks 3 times every 10 minutes to remind you to timely recharge the battery. 


Usage and Maintenance 

  • Fully charge the light in time to ensure normal use next time. 
  • Recharge a stored light every four months to maintain the optimum performance of the battery.
  • Once charging is completed, be sure to close the anti-dust cover to maintain the dustproof and waterproof ability.


  • Do NOT place this in reach of children!
  • Do NOT shine the light directly into the eyes of anyone!
  • Do NOT shine flammable objects at close range, to avoid burning objects or causing danger due to high temperature!
  • Do NOT use the light in inappropriate ways such as biting in the mouth, to avoid personal injury if the light or internal battery fails!
  • This light will accumulate a lot of heat while working, resulting in a high temperature of the flashlight shell. Pay attention to safe use to avoid scalding.
  • Turn off and lock the light to prevent accidental activation when the light is placed in a closed and flammable environment such as pockets and backpacks!
  • The LED of this flashlight is not replaceable; so the whole light should be replaced when the LED reaches the end of its life.

Q1. Which part of E03R V2.0 has been improved compared to the E03R?


  • Max output improved to 500 lumens.
  • The beam distance improved to 90 meters.
  • Runtime improved to 30 hours.
  • Battery capacity improved to 400mAh.
  • Decorative pulse light added.
  • Intelligent memory circuit added.

Q2. What kind of LEDs are used in E03R V2.0? Does Fenix offer to replace LED?

A: Two white light LEDs and a red light LED with a lifespan of 50000 hours.

Fenix does not provide LED replacement services for the time being, and users are not recommended to replace the LEDs independently, which may affect product performance and cause product damage.


Q3. Why does the E03R V2.0 downshift to a lower mode after being used for a while and the higher mode cannot be selected?

A: There are two reasons:

  1. Intelligent Overheat Protection 
    The flashlight will accumulate a lot of heat when used at relatively high output levels for extended periods. When the flashlight reaches a temperature of 60°C or above, the light will automatically step down a few lumens to reduce the temperature. When the temperature drops below 60°C, it will then allow the user for the reselection of the modes.
  2. Low-voltage Warning
    When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until Eco output is reached. When this happens in Eco output mode, the battery level indicator blinks to remind you to timely recharge or replace the battery. 

Q4. What is the color temperature of E03R V2.0?

A: 6500K.


Q5. What is the working voltage of E03R V2.0?

A: 3.0-4.2V.


Q6. What is the runtime of the High output of E03R V2.0?

A: The runtime of the High output is 1 hour and 20 minutes. The light will rapidly accumulate a lot of heat when used on 500 lumens / High output. When the light reaches a temperature of a certain level, the light will automatically step down a few lumens to reduce the temperature. So the runtime of High output is measured in a total of runtime including output at reduced levels due to temperature or protection mechanism in the design. The stated data are from the results produced by Fenix through its laboratory testing under the temperature of 21±3°C according to the ANSI/PLATO FL1 standard. (For specific runtime performance, refer to the runtime graph in the manual)


Q7. Is E03R V2.0 rechargeable? How long is the charging time? 

A: E03R V2.0 is rechargeable.  The charging time is about 2 hours. 


Q8. Is the battery of E03R V2.0 replaceable?

A: No. E03R V2.0 uses a built-in 400mAh Li-ion battery.


Q9.  Is the E03R V2.0 battery port waterproof?

A.  The light is waterproof so long as the battery port cover is in place.


Q10. What should I do if the E03R V2.0 needs repair?


  1. 15-day replacement: Fenix will replace identical or equal products with documented manufacturing defects within 15 days of purchase.
  2. 2-year free repair: Fenix will repair a light free of charge within 2 years of purchase if problems develop with normal use.
  3. Lifetime maintenance: If repair is required after 2 years from the date of purchase, Fenix will charge for parts. The total repair fee is dictated by the cost of the replaced materials.
  4. If you need warranty service, fill out the warranty form at https://www.fenixlighting.com/pages/warranty-repairs to start your repair claim.

Product Videos

Customer Reviews

Based on 170 reviews
Great light

I have several Fenix lights and am very happy with all of them.
I wanted a small,bright light to keep in my pocket at work and when out and about, for the times you wish you had a light at hand.
This really fits the bill and man is it bright for such a small light!
I can't think of a shortcoming for this little light. Various brightness modes and red for night vision. Seems to last quite some time when fully charged as well.
I also like the fact that you can lock the light so it doesn't get turned on inadvertently when in your pocket.

decepitively powerful

This light is much brighter and runs longer than expected. It does get a little warm with prolonged operation but nothing extreme. Occasionally, it will get turned on by my keys even when using the lock feature, but that has been quite rare and not hurt anything. Like every Fenix product I have experienced, I am impressed.

David Walker
Very nice but still needs improvement

I wear a flashlight around my neck all the time except for when I shower. This is a perfect size and shape for that. I previously had a Streamlight Macrolight that I wore which is also really nice but a little larger. Cons- the button needs re-design. I think a larger protective border around the button would not only make it more identifiable by feel which would solve the issue with grabbing the light and not being able to tell which side the button is on! Granted you can just pinch the light and irregardless of the side the button happens to be on the light will power on but I just prefer to keep the button facing up away from my chest at all times and this design change would make that easier; as well as giving a little more protection against accidentally activating the light. While talking about the button it REALLY needs a momentary "ON" like a tailswitch has. The type where you can just lightly press the button and the light comes on until you release pressure. Most of the time I only need momentary light and my Macrolight was perfect at that! Just push the button but don't click it and the light is on until you release! Ideal! This light makes you turn it completely on then turn it back completely off. They REALLY need to fix that. The UI on this light is definitely NOT simple. I've had it for a couple of weeks now and I STILL have not figured out how to really use it. I'd much rather the main button be momentary on or click on at whatever setting you left it at, then if I need a lower level a secondary switch of some sort would be better than trying to cycle through all these different modes on one button! I'm sure many prefer that I just have a hard time memorizing all the instructions. I still have NOT completely figured out how to go to red light. I really wish there was a way to go right into red light only without cycling through white light! I'm a First Responder and use red light all the time at night and this is awesome for offering red BUT you have to activate white to get to it!! No Bueno!! The size is ideal, the shape is perfect, the power is incredible (especially for such a small light!!) The water resistance is great as well as it being very robust and appears to be "paramedic proof!" LOL Basically it is an awesome little light BUT does have a busy UI. If all you really need is white light then you will have no complaints with this light but if, like me, you also utilize red light frequently you MIGHT find it to be a bit confusing (at least it is for me.) I could personally do without the blinking red mode. Then the power button also activating 'breathing mode' AND checking battery level makes this one button do so much! Too much in my honest opinion! I would not let it prevent you from getting this light because it REALLY is a super awesome little light... and I do mean little!! I just prefer reviews where people report the pros AND cons to aid me in deciding. After I have had this light a while I may get to the point where the UI is second nature but 2 weeks in I am still lost! LOL If you asked me to show you the red light it would take me a minute or two to get there!! LOL The engineers definitely need to address that. I use the turbo power white light constantly and I'm VERY impressed with the battery life and I LOVE that it is USB-C. Plus it charges to FULL quickly. It is a wonderful, very powerful tiny light! My back fence is about 80 yards to the treeline and I can shine this back there standing at our backdoor and it lights up all the way back there!! If something or someone was back there I could easily see them with this tiny light (and it doesn't even really get that hot!) I'm very happy with it but I do hope they will re-work the UI to provide a way to go straight into RED light and maybe get rid of some other modes that clutter up the UI. Maybe add a secondary selector button/switch on the side or something? So that's why I gave it 4 stars instead of 5. It's ALMOST perfect! Tweak the UI a touch more and y'all will have designed the perfect light!!! ✌️

I totally understand the UI and trying to learn it on this one - the factory changed the UI from the original version and I am still getting used to the differences myself. I agree it would be nice to be able to go straight to red light without it hitting the white light first (several of our other lights can do that), the red light isn't too complicated once you remember it. It's a long hold on the button. So, holding down the button for .5 seconds turns on the light. If you want to turn it on and go to the red, you just hold it down longer - for 1.2 seconds. So from off, hold the button down and you will briefly see the white light and just keep holding the button down and it will change to red. If you are in any of the white modes and want to turn it to red, just hold down the button until it changes. And then lock-out is a 3 second hold - with unlocking it also being 3 seconds. Not sure if that cleared anything up for you or not. lol

I liked it while it lasted

I'm a Fenix fan, and have close to a dozen varied Fenix flashlights. I purchased one of these and liked it so much I purchased a second one. However, with extremely light use one has stopped working. Note that this has been recharged maybe monthly over the past few years, if even that much.

While I will continue to buy other Fenix flashlights, I won't be purchasing another one of these. I'm hoping my second light will last a bit longer.

Have you contacted our warranty department for assistance? warranty@fenixlighting.com 888-775-9996 ext 1

John Mourry
Don't like

I don't like the fact that you have to recharge plus finding a keyring to fit is impossible not happy at all

Hi John - this particular light is advertised as a rechargeable light, which is going to mean that you will have to recharge it. We do have a keychain light that uses AAA alkaline batteries if that is what you prefer. The E03R V2.0 should have come with a key ring for the light. If you do not like the light at all, you can reach out to our warranty team to initiate a return. warranty@fenixlighting.com

Keychain light using alkaline battery:

Great little pocket carry flashlight

Have had this for a couple of weeks now.Great light, easy to change the brightness to suit. My only complaint about this is the directions could provide more details. You'll have to play with it a bit to figure everything out.

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