The LT360 is an excellent primary night diving light. Using 3 CREE LEDs and a wide-angle reflector you will be illuminating a wide field of view. Multi-position button switch HIGH-MID-OFF. HIGH is 1000 lumens, MID is 500 lumens. Battery duration – 2.3H @ 1000 lumen / 4H @ 500 lumen. Uses 1 x 26650 4000mAh 4.2V Li-ion rechargeable battery. Fully charged in 5 hours with Micro USB (DC1A/5.0V). Overall Length: 5.5” (140 mm).