3 Light Modes and Red Safety LightThe LED headlamp features 2 light types (red safety taillight and COB LED) and 3 modes (high beam, low beam, and flashing). Simply press the red button on the battery compartment to simultaneously activate the headlamp and the red safety taillight. The red warning light emits a bright glow visible for several blocks, helping to prevent potential collisions. USB RechargeableThis headlamp has a built-in battery, so you won't need to buy additional batteries. You can charge it via the USB port and the included USB charging cable. A full charge takes approximately four hours. Water Resistant and LightweightThis LED headlamp weighs only 109g (3.8oz), making it very easy to carry. It has an IPX4 rating for high water resistance, allowing for use even on rainy days. It protects against heavy rain or snow from any angle. Adjustable and with power indicator The LED headband is adjustable to fit all head sizes and holds securely. The rear light has four indicator lights that clearly show how much power is left.