®
User Manual
Features
• LED Premium CREE XP-E2 R2 LED
• Maximum output of up to 260 lumens
• Integrated “Precision Digital Optics Technology” provides exceptional throw
capability in its class.
• Boasts a peak beam intensity of 10,000cd and a throw distance of up to 200
meters
• Maximum runtime of up to 55 hours
• Two rapid switching modes suit various user requirements.
• User-defined mode allows for customized brightness levels and a multitude of
functions
• Intelligent memory functions
• Reverse polarity protection
• Toughened ultra-clear mineral glass with anti-reflective coating
• Purpose designed reflector ensures a smooth and powerful beam
• Aero grade aluminum alloy
• HA III Military grade hard anodized
• Purpose-made rhombic knurling for better grip
• IPX-8 standard waterproof (submersible to two meters)
Dimensions
Length: 155mm (6.1”)
Head Diameter: 25.4mm (1”)
Tail Diameter: 21.5mm (0.85”)
Weight: 68grams (2.4oz)(without battery)
Thanks for purchasing NITECORE!
SYSMAX Industry Co., Ltd.
TEL: +86-20-83862000
FAX: +86-20-83882723
Web: www.nitecore.com
Address： Rm1407-08, Glorious Tower, 850 East Dongfeng Road,
Guangzhou, China 510600
Brightness & Runtime
ALL-ROUND Flashlight Expert
Accessories
Lanyard, spare plastic cap,
and spare O-ring
Battery Options
Operation instructions
Battery Installation
1. Unscrew the tail cap in a counter-clockwise direction.
2. Insert two AA batteries with the positive pole pointing forward (toward the
light head).
Switching ON/OFF
Switch ON: Press the button on the tailcap until a “click” is heard.
Switch OFF: Press the button at the tailcap a second time until a “click” is
heard.
Mode Switching
The Nitecore MT21A has two modes: Turbo and user-defined. These two
modes can be changed by simply tightening and loosening the flashlight head.
Turbo provides 100% output while user-defined mode contains five selectable
sub-modes.
Turbo Mode
Turbo mode is accessed when the MT21A flashlight is switched ON and the
head lightly tightened. While in this mode, momentary illumination can be
achieved by switching off the flashlight and then half pressing and holding the
switch. Momentary illumination can be used as a flashing signal indicator or
apply to various tactical applications.
Note: After three minutes’ using of turbo mode, the flashlight will lower its
output automatically for preventing overheating, and efficiently ensure the
battery runtime.
User-Defined Mode
User-defined mode is accessed by slightly loosening the flashlight head. In this
mode, lightly and rapidly pressing the switch will cycle through brightness and
other functions in the following order: “High-Mid-Low- SOS-Strobe”. Pressing
the switch all the way down will save and memorize a desired setting.
Tips: Make NITECORE MT21A your perfect multi-task flashlight.
NITECORE MT21A flashlights essentially have two modes: Turbo mode (100%
output) and custom mode. Turbo mode is accessed by tightening the flashlight
head while any of one of the four customizable modes (strobe, low, medium
and high) are selected by loosening the head and rapidly pressing the on/off
switch to cycle through the modes. A given mode can be saved by simply turn
off the light while in that mode. Real-world examples include: When used as a
flashlight around the home, the head can be loosened and low level selected in
custom mode, providing long runtimes at a lower light intensity. The same
flashlight could then be taken out and used as a law-enforcement duty light,
with user-defined mode set in strobe, making it easy to alternate between turbo
mode and strobe with a simple twist of the flashlight head.
Maintenance
Every 6 months, threads should be wiped with a clean cloth followed by a thin
coating of silicon-based lubricant.
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
※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.
TURBO HIGH MID LOW
LUMENS
130
LUMENS
260
LUMENS
60
LUMENS
15
5
h
2
h
12
h
55
h
200m (Beam Distance)
10000cd (Peak Beam Intensity)
IPX-8, 2m
(Waterproof AND Submersible)
1.5m (Impact Resistant)
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 (Recommended)
Primary FeLiPO4 battery
14500 3.2V
N (Banned)
Rechargeable Li-ion battery
14500 3.7V
N (Banned)
NOTICE
Stated data has been
measured according to
the international
flashlight testing
standards ANSI/NEMA
FL1 using two high
quality AA Ni-Mh
rechargeable batteries
(1.2V, 2400mAh) under
laboratory conditions.
The data may vary due
to individual usage
habits and environmental
conditions.
WARNING
1. Ensure batteries are
inserted with the positive
(+) end pointing to the
head. The MT21A will not
operate with incorrectly
inserted batteries.
2. Please do NOT light
directly to the eyes,
which will hurt the eyes.
20150911
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