Nitecore SRT 3 DEFENDER User Manual

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 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)

· 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)(with AA extension tube)
(without battery)

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.

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.

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

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®

ALL-ROUND Flashlight Expert

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).

Output & Runtime

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)

IPX-8, 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

Accessories

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

Battery Options

SYSMAX Industry Co., Ltd.

TEL: [phone]
FAX: [phone]
E-mail: [e-mail]
Web: www.nitecore.com
Address： Rm1401-03, Glorious Tower, 850 East Dongfeng Road,

Guangzhou, China 510600

Warranty Service

All NITECORE® products are warranted for quality. Any defective /
malfunctioning NITECORE® product 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 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.
For the latest information on NITECORE® products and services, please
contact a local NITECORE® distributor or send an email to
[e-mail]

※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, information on
our official website shall prevail. Sysmax Industry Co., Ltd. reserves the
rights to interpret and amend the content of this document at any time
without prior notice.

®

ALL-ROUND Flashlight Expert

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.

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 to
assemble the body, and you can use one AA battery to power the light.

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AA extension tube

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