Lightweight and compact USB rechargeable headlight with a powerful 500 Lumen XM-L LED. Interchangeable internal EnergyBar (BLS-93) battery that can be charged quickly and easily via USB. Since powerful lamps produce a lot of heat, the BLS-72 is equipped with Airflow Cooling System (ACS) for optimum heat control. Equipped with 5 modes: extra high power, high power, normal power, low power and flashing light. The housing and the built-in rubber switch are water-resistant.