Fenix E03R Keychain Flashlight

Max Lumens: 260
Modes: 6
Battery: Built-in
(149 customer reviews)


The Fenix E03R rechargeable keychain flashlight will produce a maximum 260 lumens and throw the light a distance of 138ft (42m). The top switch operates on/off and allows you to select from six lighting modes, including four brightness levels plus red light and red flashing. The battery level indicator lets you know when the battery needs charging. Quickly recharge the built-in battery via the USB Type-C charging port. At less than 2″ long, not only is it the perfect everyday carry size, but it is rugged too with an IP66 rated splashproof and dustproof rating. Keep this light on your keys, in a pocket, or in a drawer to always have a flashlight at your fingertips. The E03R would even make a great gift that person in your life that you know should have a bright light handy at all times, but that you can’t convince to carry a full sized flashlight. Astonishingly bright for its small size, we know the Fenix E03R will become an instant favorite keychain flashlight.

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Max Lumens: 260
Modes: 6


E03R spec sheet

E03R Size:

Length: 1.85” (47mm)
Width: 0.94” (24mm)
Height: 0.47” (12mm)

E03R Weight:

0.78 oz. (22g) including battery

E03R Battery:

Built-in 200mAh Li-polymer battery


Key chain, USB Type-C charging cable
Please note: The E03R DOES include a USB Type-C charging cable for orders after 8/20/20.


Limited Lifetime Guarantee from Fenix Lighting USA

Additional Features of the Fenix E03R Keychain Flashlight

  • MATCH CA18 white light LED and Everlight 2835 red light LED, with a lifespan of 50,000 hours.
  • Built-in 200mAh Li-polymer battery.
  • Battery level indication and low-voltage warning.
  • Intelligent overheat protection against high surface temperature.
  • All-metal CNC machining light body.
  • Premium type HAIII hard-anodized anti-abrasive finish.
  • Recessed switch and lockout function.

Operating Instructions of the Fenix E03R Keychain Flashlight

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.

Output Selection for Keychain Flashlight
White light: single click the switch to cycle through Eco→Low→Med→High.
Red light: single click the switch to cycle through Red→Red Flash.

Lock: with the light switched off, double click the switch to lock the light, the light will blink twice on Low to indicate locked status.
Unlock: with the light locked, double click the switch, the light will be unlocked and activated on Low.
In locked status, clicking or pressing the switch will activate 2 one-second blinks on Low to indicate locked status.

Charging Your Keychain Flashlight

  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 to green when fully charged.
  3. Once charging is completed, be sure to close the anti-dust cover.


  1. The normal charging time is approximately 1 hour and 20 minutes from depletion to full charging.
  2. Recharge a stored light every four months to maintain optimum performance of the battery.

Battery Level Indication
With the light switched off, single click the switch to check the battery status. The battery level indicator will display the battery status for 3 seconds.

  • Green constant on: saturated (100% – 70%)
  • Green flashes: sufficient (70% – 40%)
  • Red constant on: poor (40% – 10%)
  • Red flashes (2Hz): critical (10% – 1%)

Note: The battery status will be displayed each time the light is switched on.

Intelligent Protection
The light will accumulate a lot of heat when used on High output level for extended periods. To reduce the temperature, the light will automatically step down a few lumens. High output level can be reselected if needed.

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 on Eco output mode, the battery level indicator blinks red to remind you to recharge the battery. To ensure normal use, the flashlight will not turn off automatically and will work till the battery is depleted.

Usage and Maintenance

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


  • This flashlight is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the flashlight directly into anyone’s eyes.
  • All information provided in this manual is subject to change without prior notice.

149 reviews for Fenix E03R Keychain Flashlight

Based on 149 reviews

Customer Images

Image #1 from Reuben S.
Image #1 from Reuben S.

Reuben S.

Way smaller, way brighter than expected. I was expecting a flashlight that was approximately the size of the keyfob for my vehicle, but it's actually about half the size. What a pleasant surprise. I've carried it around with me for about a month now, and unlike other reviewers, I haven't yet had the light turn on by accident. It charges with USB-C port, which is perfect. I took a few photos to show how much brighter this is than the LED light on my phone, but it really wasn't a fair comparison. It's in a completely different class of light. As a home inspector, I was turned on to the 258 lumen Fenix TK11 back around 2008 or so, and I thought it was the greatest thing ever, compared to the huge flashlights that I used to use. I've moved on to bigger and better flashlights since then, but I still have my TK11, so I pulled it out of retirement to take some comparison images with the EO3R. This tiny little keychain light kicked the butt of what used to be my primary work light! This would make for an awesome stocking stuffer.

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Image #1 from Reuben S.
  1. Seth P. (verified owner)

    I absolutely love this little yet powerful light!! Great job Fenix on yet another amazing product!!

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  2. Mary G. (verified owner)

    Present for my partner and he’s very happy with it, great size to fit on keychain. The fact that it’s rechargeable is a big plus.

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  3. jack liford (verified owner)

    Perfect for taking the dog out at night. This little flashlight comes in handy all the time. Several
    times though it has managed to “jump” out of the lock mode and someone has told me a light is on in my
    pocket. One time I felt something warm and yep it was full ablaze in my pocket even though I locked it. It’s still
    a genius design. The red led is a super cool and useful feature that’s a real bonus on a light at this price point.
    It’s fun to toggle through the modes once you learn them. I wish they made a little rubber/silicone protective
    sleeve because they do get scratched up.

    2 out of 2 people found this helpful. Was this review helpful to you?
  4. Louis (verified owner)

    This is a terrific keychain light. Multi-functional but tiny.

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  5. Jason Clark (verified owner)

    Great little flashlight!

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