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User Manual
Features
· 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 U2) 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 IPX8 (two meters submersible)
· Impact resistant to 1.5 meters
· Tail stand capability
Dimensions
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, without battery)(with AA extension tube)
Accessories 
Quality holster, removable clip, AA extension tube,  lanyard, spare tail cap button and spare 
O-ring
Battery Options
Output & Runtime
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. 
Battery Installation
Insert one (R)CR123 battery with the positive pole pointing forward (toward the light head).
Switching ON/OFF
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
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.
Adjusting Output
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.
Maintenance
Every 6 months, threads should be wiped with a clean cloth followed by a thin coating of 
silicon-based lubricant.
Using AA extension tube
The SRT3 can utilize one AA extension tube. Please 
follow the diagram toassemble the body, and you can 
use one AA battery to power the light.
Warranty Details 
Our authorized dealers and distributors are responsible for warranty service. Should any problem 
covered under warranty occurs, customers can contact their dealers or distributors in regards to their 
warranty claims, as long as the product was purchased from an authorized dealer or distributor. 
NITECORE’s Warranty is provided only for products purchased from an authorized source. This 
applies to all NITECORE products.
Any DOA / defective product can be exchanged for a replacement through a local distributor/dealer 
within the 15 days of purchase. After 15 days, all defective / malfunctioning NITECORE® products 
can be repaired free of charge for a period of 60 months (5 years) from the date of purchase. Beyond 
60 months (5 years), a limited warranty applies, covering the cost of labor and maintenance, but not 
the cost of accessories or replacement parts.
The warranty is nullified if the product(s) is/are broken down, reconstructed and/or modified by 
unauthorized parties, or damaged by batteries leakage.
For the latest information on NITECORE® products and services, please contact a local NITECORE® 
distributor or send an email to service@nitecore.com.
※All images, text and statements specified herein this user manual are for reference purpose only. 
Should any discrepancy occurs between this manual and information specified on www.nitecore.com. 
Sysmax Industry Co., Ltd. reserves the rights to interpret and amend the content of this document at 
any time without prior notice.
Thanks for purchasing NITECORE!
SYSMAX Industry Co., Ltd.
TEL:  +86-20-83862000 
FAX:  +86-20-83882723  
E-mail:  info@nitecore.com  
Web:  www.nitecore.com
Address:  Rm1401-03, Glorious Tower, 850 East Dongfeng Road, Guangzhou, 
China 510600
®
ALL-ROUND Flashlight Expert
NOTE:
1. Ensure batteries are inserted with the 
positive (+) end pointing to the head. 
The SRT3 will not operate with 
incorrectly inserted batteries.
2. Ensure when turning the SRT3 on, the 
beam is directed away from the eyes of 
people or animals.
Note: When using the SRT3 in infinite 
brightness mode, runtime will increase 
when lower levels of output are 
selected. 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. 
TYPE
Nominal voltage
Compatible
Primary Lithium battery 
CR123 3V
Y (Recommended)
Y (Recommended)
Rechargeable Lithium battery 
RCR123 3.7V
TYPE
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*
LUMENS
4500cd
(Peak Beam Intensity)
2800cd
(Peak Beam Intensity)
1550cd
(Peak Beam Intensity)
134
m 
(Beam Distance)
 IPX8, 2
m 
(Waterproof AND Submersible)
1.5
m 
(Impact Resistant)
105
m 
(Beam Distance)
79
m 
(Beam Distance)
0.1*
LUMENS
330*
LUMENS
0.1*
LUMENS
180*
LUMENS
0.1*
LUMENS
TURBO LOWER TURBO LOWER
150
h
45
min
1
h
15
min
200
h
200
h
1
h
TURBO LOWER
1
×NL166(RCR123) 1×CR123 1×AA
AA extension tube
20161220
Please find us on facebook: 
Nitecore Flashlight
Produktspecifikationer
| Varumärke: | Nitecore | 
| Kategori: | Ficklampa | 
| Modell: | SRT3 Defender | 
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