Nitecore LED Torch SRT3 battery-powered 550 lm 87 g Grey SRT3AG Data Sheet

User Manual

· 

Purpose-designed for law enforcement, self-defense and outdoor 

applications. 

· 

The world’s first line of flashlights to feature third generation SSR 

(smart selector ring) technology

· 

Smoothly and rapidly select brightness levels and function by rotating a 

smart selector ring

· 

Utilizes the latest CREE XM-L (XM-L2 T6) LED for a maximum output of 

up to 550 lumens

· 

Second generation of ‘Crystal Coating Technology’ along with ‘Precision 

Digital Optics Technology’ provide extreme reflector performance 

· 

Boasts a peak beam intensity of 4,500cd and a throw distance of up to 

134 meters (ANSI FL1)

· 

High efficiency circuit board provides up to 200 hours runtime on lowest 

output level

· 

Equipped with unique multi-colored (red and blue) tactical / signaling 

lights 

· 

Infinite brightness adjustment from 0.1 to 550 lumens

· 

Six rapidly switchable functions to select from

· 

Reverse polarity protection

· 

Stainless steel titanium-plated clip

· 

Stainless steel retaining ring protects core components from damage

· 

Toughened ultra-clear mineral glass with anti-reflective coating

· 

Constructed from aero grade aluminum alloy

· 

Robust HAIII military grade hard-anodized

· 

Waterproof in accordance with IPX-8 (two meters submersible)

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Impact resistant to 1.5 meters

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Tail stand capability

Length: 100mm (3.9”)
 

117mm (4.6”)(with AA extension tube)

Head diameter: 25.4mm (1”)
Tube diameter: 24.3mm (0.96”) 
Weight: 73g (2.57oz)(without battery) 
 

87g (3.07oz)(with AA extension tube)

 

 

 (without battery) 

1. Ensure batteries are inserted with the positive (+) end pointing to the 

head. The SRT3 will not operate with incorrectly inserted batteries.

2. Please do NOT light directly to the eyes, which will hurt the eyes.

To switch ON: Press the button on the tailcap until a “click” is heard.
To switch OFF: Press the button on the tailcap a second time until a 
“click” is heard.

Momentary illumination can be achieved by switching the flashlight off 
and then half pressing and holding the tail switch. Release switch to turn 
the light off.

With the light turned on, slowly rotate the Smart Selector Ring (adjacent 
to the bezel) in a counter-clockwise direction to cycle through the 
following brightness levels: beacon -> SOS -> police warning signal -> 
blue mode -> red mode -> lower mode -> infinite brightness modes -> 
turbo mode -> strobe mode. These modes may be cycled through in 
reverse by rotating the Smart Selector Ring in a clockwise direction.

All NITECORE® products are warranted for quality. DOA / defective 
products can be exchanged for replacement through a local 
distributor/dealer within the 14 days of purchase. After 14 days, all 
defective / malfunctioning NITECORE® products will be repaired free of 
charge for a period of 18 months from the date of purchase. After 18 
months, a limited warranty applies, covering the cost of labor and 
maintenance, but not the cost of accessories or replacement parts. The 
warranty is nullified in all of the following situations:
1. The product(s) is/are broken down, reconstructed and/or modified by 

unauthorized parties.

2. The product(s) is/are damaged through improper use.
3. The product(s) is/are damaged by leakage of batteries.
To guarantee a swift and effective customer service, Nitecore suggest 
you to contact the point of purchase for assistance. 
For the latest information on NITECORE® products and services, please 
contact your national NITECORE® distributor or send an email to 
service@nitecore.com 

The Nitecore official website shall prevail in case of any product data 
changes.  

®

NITECORE (SYSMAX) is a member of PLATO, participating in and 

helping to develop the ANSI/NEMA FL1 standard of measurement. 
Product testing data is in accordance with these internationally 
recognized scientific standards.

Note: When using the SRT3 in infinite brightness mode, runtime will 

increase when lower levels of output are selected. 
NB: 

For user safety and to prevent overheating / failure, the SRT3 will 
automatically switch to high mode after three minutes of use in Turbo 
mode. Slowly rotate the Smart Selector Ring or press the tail switch again 
to reactivate turbo mode when needed. 

Every 6 months, threads should be wiped with a clean cloth followed by a 
thin coating of silicon-based lubricant.

The SRT3 can utilize one AA extension tube. Please follow the diagram to
assemble the body, and you can use one AA battery to power the light.

NOTICE
The above data has been measured in accordance with the international 

flashlight testing standards ANSI/NEMA FL1 using one x 3.7V 650mAh 

Nitecore RCR123 battery, one x 3V 1550mAh Nitecore CR123 battery 

and one x 1.2V 2500mAh AA battery under laboratory conditions. The 

data may vary slightly during real-world use due to battery type, 

individual usage habits and environmental factors.

Infinite brightness adjustment varies from 0.1 to 550 lumens and is 

manually adjusted by rotation of the Smart Selector Ring. Subsequently, 

runtimes will vary anywhere from 45 minutes to 150 hours depending on 

chosen level of output. 

Insert one (R)CR123 battery with the positive pole pointing forward 
(toward the light head).

SIZE

Nominal voltage

Compatible

Primary Lithium battery 

CR123

3V

Y (Recommended)
Y (Recommended)

Rechargeable Lithium battery 

RCR123

3.7V

SIZE

Nominal voltage

Compatible

Primary AA battery

AA

1.5V

Y (Recommended)

Rechargeable AA battery

AA

1.2V

Y (Recommended)

Primary AA Lithium battery

L91

1.5V

Y 

Primary LiFePO4 battery

14500

3.2V

Y

Rechargeable Li-ion battery

14500

3.7V

Y (Recommended)

With AA extension tube:

550*

cd

cd

cd

0.1*

330*

0.1*

180*

0.1*

1×NL166(RCR123)

1×CR123

1×AA

Quality holster, 
removable clip, 
AA extension tube,  
lanyard, spare tail cap 
button and spare O-ring