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Nitecore TSL10i 4 Color Signal Light Tailcap for P10i, P10iX, P20i, P20iX and P30i Flashlights
NITECORE TSL10i 4r Color Signal Light Tailcap

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Price: $19.95

Availability: Usually Ships in 24 Hours
Product Code: ACC-NITE-TSL10I



  • Compatible with i generation flashlights (P10i, P20i, P10iX, P20iX, P30i)
  • Multiple flashing modes
  • Mode memory
  • Red/Blue police warning flashing

Included in the Box

  • TSL10I

4 Color Signal Light Tailcap for P10i, P20i, etc.

The TSL10i is an upgraded tailcap that maintains all of the original goodies and adds more - four more. Encircling the familiar dual function tail switch and mode pedal, with Nitecore's patented Strobe Ready Technology TM, is a LED ring with four different signal indicators. The TSL10i's signal ring can be set to blink blue, red, green, white, or alternating blue and red. This signal ring is independent of the flashlight and can work while the main light is on or off, providing you host of tactical options in visual identification.

Plug and Play Simple Installation and Operation

The Installation and operation of the TSL10i are incredibly simple. Just replace the standard tailcap on your P20i or i4000R. You will notice a tactile switch on the side of the tailcap that controls the signal ring. Hold this button and the TSL10i will cycle from blue - red - green - white - police (blue & red), release the switch at the desired setting and the TSL10i will start operating in that mode. To turn off the TSL10i just tap the side button. The mode memory function will return the TSL10i back to the setting you were using previously for subsequent activations.

Ready for Duty

The efficient LEDs of the TSL10i draw power straight from the flashlight's battery. The four single color flashes all last over 300 hours or 12 days. These can be used as an emergency signal or beacon. The red-blue police warning can last over 72 hours giving duty personnel more than an entire day of field use! Built from the same tough HA III finished aero-aluminum the TSL10i brings new strengths and no weakness to your tactical light.

Note: When using with P30i model, it adds the function of adjusting the brightness from the tail end. However, the original tail cap is still needed if you plan to charge the battery inside the flashlight. The other i series models have the charging port in the front so there is no such limitation.


Dimensions L-1.82"xW-1.26"xH-1.26"
Weight 1.2oz


Blue Flashing 330 hr
Red Flashing 360 hr
Green Flashing 300 hr
White Flashing 300 hr
Red/Blue Police Warning Flashing 72 hr
Nitecore TSL10i
Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 5 Write a review »

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  1 of 1 people found the following review helpful:
5 of 5 Very Nice Addition January 3, 2022
Reviewer: Chester Sopczak from Kingwood, TX United States  
This wasn't something I needed but thought it would be an interesting addition to my P20ix.  It does add some length to the light but it still fits perfectly on the NTH20 Holster. The user interface is easy and you can change the colors quickly. The LEDs are not overpowering and are perfectly suited for signaling or finding your light in the middle of the night when camping.

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  0 of 0 people found the following review helpful:
5 of 5 Tail Cap Light November 18, 2021
Reviewer: Anonymous Person from Boston, MA United States  
The quick function button to enable and change the signal light is great. The tail cap fits seamlessly on the flashlight and although it increases the  overall length of the light, I feel the trade off is acceptable.

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  0 of 0 people found the following review helpful:
5 of 5 Excellent August 2, 2021
Reviewer: Andre C. Ellerbe from Durham, North Carolina  

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  0 of 0 people found the following review helpful:
4 of 5 February 8, 2021
Reviewer: D Holton from Archer, FL United States  

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  0 of 0 people found the following review helpful:
5 of 5 great replacement February 2, 2021
Reviewer: andrei petrutiu from monterey, CA United States  
Have purchased this tailcap to replace the one which equipped the i4000R originally (did not like the fact that the original cap has the same diameter as the main body of the flashlight and didn't want the rotating cover ring for the built-in charger).  Having a larger overall diameter, the TSL10i offers better ergonomics:  when holding and operating the flashlight, it does not slide off your palm and allows for a better grip.  Did not have any interest in the multi-color light feature of the cap, and do not intend to use that either.

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