Nitecore USB Rechargeable Helmet Signal Light can be used with helmets, ARC rail, vests or backpacks or any Velcro surface or MOLLE System. It is specifically designed for the military and law enforcement tactical use cases. It has USB-C Port for Internal Recharging of inbuilt battery, 1.5hrs for full charge. It has utilizes 5 x high performance LEDs. Available with 11 modes including 5 colors constant-on, flashing and red/blue police warning strobe. Powered by 300mAh built-in Li-ion battery with a max runtime of 50 hours. Built-in Li-ion battery charging circuit with a USB-C port, can be operated while charging. Easy-to-reach one switch output control for one-handed operation. A power indicator within the body indicates the remaining battery power. Lightweight bracket included with hook-and-loop attachment on the back. It is constructed of a durable PC materials. Impact resistant to 1 meter. Brightness outputs: red - 3 lumens, constant: 10 hours, flashing: 50 hours. Green - 8 lumens, constant: 11 hours, flashing: 50 hours. Yellow - 9 lumens, constant: 11 hours, flashing: 50 hours. White - 15 lumens, constant: 7 hours, flashing: 40 hours. Blue - 2 lumens, constant: 6 hours, flashing: 40 hours. Red/blue police strobe: 40 hours. IPX Rating: IP66.