Fenix TK20R V2.0 Reference Manual and SpecificationsUpdated 2 hours ago

The Fenix TK20R V2.0 is a rechargeable dual rear-switch multipurpose flashlight. This summary is drawn from the manufacturer's official user manual — see the downloadable PDF reference manual on the product page for complete details.

Warning

Place this light out of 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 it in the mouth, to avoid personal injury or life-threatening harm 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 or remove the battery 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; the whole light should be replaced when the LED reaches the end of its life.

Product Features

3000 lumens maximum output; 475 meters maximum beam distance
One Luminus SFT70 LED with a lifespan of 50,000 hours
Includes a Fenix ARB-L21-5000 V2.0 rechargeable Li-ion battery
Advanced Pulse-Frequency Transmission System (APF)
Instant activation and strobe with the dual tactical tail switches
Hidden USB Type-C charging port
Internal dual-spring structure ensures stable lighting even under severe impact
Made of durable A6061-T6 aluminum
Premium type HAIII hard-anodized anti-abrasive finish
Size: 6.02'' x 1.34'' x 1.00'' / 152 x 34 x 25.4 mm. Weight: 7.20 oz / 204 g (including battery)

Operating Instructions

Switches: the round tail switch (A) is the tactical switch for instant activation; the oval tail switch (B) is the functional switch for output selection and instant strobe.

On/Off: tap the tactical switch to silently and momentarily turn on the light; release it and the light will go out. Fully press the tactical switch to constantly turn on the light; press again and the light will go out.

Output Selection: with the light switched on, single click the functional switch to cycle through Eco, Low, Med, High, and Turbo.

Strobe: press and hold the functional switch for 0.5 seconds to enter Strobe; release it and the light will go out.

Technical Parameters (ANSI/PLATO FL1)

Turbo: Output 3000 lumens, Runtime 2 h 50 min*, Distance 475 meters, Intensity 56,600 cd.
High: Output 1000 lumens, Runtime 3 h 10 min, Distance 265 meters, Intensity 17,620 cd.
Med: Output 350 lumens, Runtime 7 h, Distance 150 meters, Intensity 5,860 cd.
Low: Output 150 lumens, Runtime 21 h 20 min, Distance 100 meters, Intensity 2,500 cd.
Eco: Output 30 lumens, Runtime 48 h, Distance 45 meters, Intensity 490 cd.
Strobe: Output 3000 lumens.

Impact Resistance: 1 meter | Water Resistant: IP68 (Submersible)

Note: according to the ANSI/PLATO FL1 standard, the above specifications are from the results produced by Fenix through its laboratory testing using the included Fenix ARB-L21-5000 V2.0 battery under the temperature of 21±3°C and humidity of 50%-80%; the true performance of this product may vary according to different working environments and the actual battery used. *The Turbo output is measured in total of runtime including output at reduced levels due to temperature or the protection mechanism in the design.

Battery Specifications

Fenix ARB-L21-5000 V2.0 (21700, 3.6V): Recommended.
Fenix ARB-L21-5000U (21700, 3.6V): Recommended.
Fenix ARB-L21-4000P (21700, 3.6V): Recommended.

It is prohibited to use 18650, 16340, or CR123A batteries. 21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Only use quality batteries with circuit protection to reduce the potential for combustion or explosion; cell damage or short circuiting are potential risks the user assumes.

Battery Replacement: unscrew the light tail and insert the battery with the anode side (+) towards the light head, then screw the light tail back on.

Charging

Loosen the light head counterclockwise to reveal the USB Type-C charging port 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.
The indicator will display red while charging and will turn green when fully charged.
Once charging is completed, be sure to tighten the light head to maintain the dustproof and waterproof ability.

Note: when charging fails or the battery is reversely connected, the battery indicator will flash red to remind the user to check the battery. The normal charging time of the included Fenix ARB-L21-5000 V2.0 battery is approximately 3.5 hours from depletion to full charging. Recharge a stored light every four months to maintain the optimum performance of the battery. The light is unavailable while charging.

Battery Level Indication

Each time the light is turned on, the indicator (unscrew the light head to see) 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 21700 rechargeable Li-ion battery.

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 light blinks 3 times every 5 minutes to remind you to timely recharge or replace the battery. This only works with a Fenix ARB-L21 series 21700 rechargeable Li-ion battery.

Usage and Maintenance

Disassembling the sealed head can cause damage to the light and will void the warranty.
Fenix recommends using only a high-quality protected battery.
If the light will not be used for an extended period, remove the battery for proper storage.
Unscrew the tail cap or remove 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 battery contacts improves the light's performance, as dirty contacts may cause the light to flicker, shine intermittently, or even fail to illuminate — check for a poor battery level or dirty contacts, and contact your authorized distributor if cleaning doesn't resolve it.

What's Included

Fenix TK20R V2.0 flashlight, ARB-L21-5000 V2.0 Li-ion battery, USB Type-C charging cable, Lanyard, Holster, 2 x Spare O-rings, User manual, Warranty card.

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