ATACTICAL/WOWTAC A1 LED Flashlight, Pocket-Sized LED Torch, Super Bright 550 Lumens CREE LED, IPX7 Water Resistant, 5 Modes Low/Mid/High/Trubo/Strobe for Indoors and Outdoors NW;

Specification:

LED: CREE XP-G2 LED with a lifespan of 20+ years of run time.
Runs on: Atactical li-ion 18650 battery (3.7V/2600mAh).
Working voltage: 2.7V-4.2V
Output & Runtime (Tested with Atactical li-ion 3.6V/2600mAh)

Strobe(550 lumens /4 hrs), 
Turbo(550 lumens/3.3 hrs), 
High(200 lumens /5.5 hrs), 
Medium(63 lumens /19 hrs), 
Low(10 lumens /5.5 days).

Peak beam intensity: 10520 cd (max.)
Max beam distance: 205 meters (max.)
Waterproof to IPX-7 Standard (1 meters).
Impact resistant: 1.5 meters.
Dimensions: 136mm*25.4mm
Weight: 86g (excluding battery).
Accessories: USB Rechargeable Li-ion 18650 battery*1, Cable*1,Spare O-ring*2, Pocket Clip*1

Operation

Turn ON/OFF
Press the tail switch to turn the light on/off.
Change Modes 
When the light is on, one click the side switch within 2 seconds to cycle through low, medium, high, Turbo and SOS.
The mode will be Low if the clicking is over 2 seconds. When the light is ON, Long Press to access Strobe.
Memory Function
The light will turn on in the last mode accessed, SOS and strobe will turn on in the Turbo mode.
Low Voltage Indication
The light will blink twice if the battery is low.