Operating Instructions

On/Off

Tap the tactical switch to turn on the light momentarily, release it and the light will go out. 
Fully press the tactical switch to constantly turn on the light, fully press the tactical switch again to turn off the light.

Mode switching

In any state, turn the tail toggle switch to select the needed mode, turn the toggle switch to the left end to enter Duty mode, turn the toggle switch to the right end to enter Tactical support mode, to the middle to enter Lockout/off mode.

Output Selection  

Duty mode: In Duty mode, single click the functional switch to cycle through Low→Med→High→Turbo.
Tactical support mode: In Tactical support mode, single click the functional switch to cycle through White light(Low)→White light(High)→UV light→Red light→Red flash→Red & blue flash.            

Lockout/off mode: With the light turned on, turn the tail toggle switch to Lockout/off mode to turn off and lock the light. The dual tail switch will not respond to any operation.

Instant Turbo

On: With the light turned on, fully press the tactical switch and hold it for 0.5 seconds to enter Turbo, single click the functional switch to enter Low or White light(Low).

Off: Fully press the tactical switch to turn off the light.

Instant Strobe

With the light turned on, press and hold the functional switch for 0.5 seconds to enter Strobe. Single click the functional switch or tap the tactical switch to recall the previously used output.

With the light turned off, press the functional switch to enter Strobe instantly, release it and the light will go out.

Intelligent Memory Circuit 

The flashlight automatically memorizes the previously selected output excluding Strobe. When turned on again, the previously used output of the currently selected mode will be recalled.

Battery Specifications

*Do not mix batteries of different brands, sizes, capacities, or types. 
*Do not use an 18650, CR123A, or 16340 battery.
*21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Using low-quality batteries or mishandling batteries (such as short-circuiting or overheating) could lead to combustion and jeopardize the safety of users and property. Any adverse effects resulting from the use of low-quality batteries are not covered by any Fenix warranty or liability. Using quality batteries with circuit protection will reduce the potential for combustion or explosion.

Battery Replacement

Unscrew the light body and insert the battery with the anode side (+) towards the light head, then screw the light body back on.

Charging

1. Turn off the flashlight and open the anti-dust cap to reveal the charging port, then connect the USB Type-C end of the charging cable to the light.
2. The battery level indicator will display red while charging and will turn green when fully charged.
3. Once charging is completed, be sure to unplug the charging cable and close the anti-dust cover.

Note: 

1. When charging fails or the battery is reversely connected, the battery level indicator will flash red to remind users to check the battery.
2. The charging time of the included Fenix ARB-L21-5000 V2.0 battery is about 1.5 hours from depleted to fully charged with a 5 V/2 A charging adapter.
3. The flashlight cannot be operated while charging.

*Note: This only works with a Fenix ARB-L21 Series battery.

Battery Level Indication 

Each time the flashlight is turned on, the indicator will indicate the battery level and 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%

*Note: This only works with a Fenix ARB-L21 Series battery.

Intelligent Overheat Protection

The flashlight will accumulate a lot of heat when used at high output levels for extended periods. When the flashlight reaches a temperature of 60°C/140°F or above, it will automatically step down a few lumens to reduce the temperature. When the temperature drops below 60°C/140°F, the flashlight will gradually recall the preset output level.

Low-voltage Warning

When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until Low output is reached. When this happens in Low output, the battery level indicator blinks red to remind users to recharge or replace the battery in a timely manner. 

*Note: This only works with a Fenix ARB-L21 Series battery.

Usage and Maintenance

• Disassembling the sealed head can cause damage to the flashlight and will void the warranty.
• Recharge the battery in time to ensure normal use for next time.
• Fenix recommends using an excellent quality battery.
• If the flashlight will not be used for an extended period, remove the battery, or the flashlight could be damaged by electrolyte leakage or explosion.
• Lock the flashlight or take out the battery to prevent accidental activation during storage or transportation.
• Long-term use can result in O-ring wear. To maintain a proper water seal, replace the ring with an approved spare.

• Periodic cleaning of the flashlight and battery contacts improves the flashlight's performance as dirty contacts may cause the flashlight to flicker, shine intermittently or even fail to illuminate for the following reasons:

  A: Poor battery level.

  Solution: Recharge or replace the battery.

  B: The contact or contact point of the battery or flashlight is dirty.  

  Solution: Clean the contact points with a cotton swab soaked in rubbing alcohol.

If the above methods don't work, please contact the distributor.

Warning

• Do NOT place this flashlight in the reach of children!
• Do NOT shine this flashlight directly into the eyes of anyone!
• Do NOT place light head near flammable objects, high temperatures can cause objects to overheat and become flammable/ignite!
• Do NOT use this flashlight in inappropriate ways such as holding the unit in your mouth, doing so could cause serious personal injury or death if the light or internal battery fails!
• This flashlight will accumulate a significant amount of heat while operating, resulting in a high temperature of the light shell. Pay close attention to avoid burns!
• Turn off and lock the flashlight or remove the battery to prevent accidental activation when the flashlight is placed in a closed and flammable environment such as pockets and backpacks!
• The LEDs of this flashlight are not replaceable; so the whole light will need to be replaced when any one of the LEDs reaches the end of its lifespan!

What are the key features of TK25R?

A: 

• Multiple brightness levels for versatile use
• Combined spotlight and floodlight beam for both wide close-range lighting and long-distance illumination
• Multi-LED system includes tactical high beam, wide side light, UV light, red light, red flash, and red-blue flash
• Supports tactical momentary-on, one-touch turbo, and one-touch strobe functions
• USB Type-C fast charging — fully charged in just 1.5 hours
• Dual control with rotary switch and tail switch

What kind of LED is used in TK25R? Does Fenix offer to replace LED? 

A: One Luminus Cree XHP50.3- LED with a lifespan of 50,000 hours. Color temperature: 5700K.

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.

What is the working voltage of TK25R?

A: The operating voltage is 3.0V～4.2V.

What kind of battery can be used in TK25R?

A: It is recommended to use a Fenix 21700 Li-ion battery. Other Li-ion batteries are not recommended. As an unmatched battery may cause the flashlight to fail to work normally.

How to prevent accidentally activate the TK25R?

A: To prevent accidental activation, turn the rotary switch to the lock position before placing the flashlight in your bag, or loosen the tail cap to disconnect the battery.

What are the optional accessories for TK25R?

A: AOT-04 Traffic wand、ALP-20 Quick-pull holster、ALC-03 Flashlight Holder.

Why does the TK25R 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 high output levels for extended periods. When the light reaches a temperature of 55°C or above, the light will automatically step down a few lumens to reduce the temperature.

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 the Low mode is reached.

What is the APF？

A: The APF (Advanced Pulse-Frequency Transmission System) was developed by Fenix laboratory, a major technology breakthrough of flashlight industry. Allowing the tactical flashlight achieve a higher level of performance:

1. Take light to the extreme. Traditional forward switches are limited by current, and it is difficult to achieve brightness above 2000 lumens. In the age of 21700 batteries gradually expanding, 3000 lumens tactical flashlights are almost impossible; while the flashlight using APF technology can.
2. Make the functional tail cap simpler. Traditional multi-function tail cap needs to achieve functional through the double-layer body or additional channels ; and the flashlight using APF technology offering a strong reliable flashlight in simple structure, we talking about single layer body if specifically.
3. Better anti-interference performance. Complex external environments such as strong magnetic fields are easily dealt through stronger anti-interference ability.

Why does the TK25R happen to flicker?

A: The reasons that may cause the light to flicker, shine intermittently or even fail to illuminate:

1. Poor battery level.

   Solution: Recharge or replace the battery.

2. The contact or contact point of the battery or flashlight is dirty.  

   Solution: Clean the contact points with a cotton swab soaked in rubbing alcohol.

If the above methods don't work, please contact your authorized distributor.