Momentary/Constant Switch: Rotary switch to turn left side to get momentary mode. To avoid exposing your position, "Momentary" mode would not stay, the switch will spring back immediately. Rotary switch to turn right side to get constant modes.
Super Bright Gunlight: 160m beam up to 1250 lumens. It is much brighter than most other similar models pistol light.
Adjustable Rail: The weapon light fits Picatinny rails ( MIL-STD-1913) and Glock sized rails weapon guns. Rail grip clamp system securely attaches/detaches quickly and safely with no tools and without putting your hands in front of muzzle.
Built-in Rechargeable Battery: This GM-5021 is powered by a built-in battery which is rechargeable through the magnetic USB charging port at the bottom of the sight. Compared to the traditional micro USB charging port, this magnetic port is more durable and waterproof. The indicator will alert you when it's time to recharge and when it is full charged(green light)