Description: 2 XPG (350 lumens) and 1 warning light sources. While ensuring high brightness, night running light provides for your life. 2 modes can be switched at will. Mode 1: press the rubber button, front light is strong light and the tail light flashes slowly; Mode 2: press twice, the front light is medium light, and the tail light flashes quickly. Adjustable webbing with reflective strip allows you to adjust the size to suit your individual body, giving you a comfortable and pleasant feeling during the exercise. 2000 mAh lithium battery and USB charging cable, our chest light adapts to multiple USB ports, convenient for charging via computer or mobile power. Fast charging, low power consumption, and long life. Perfect for cycling, running, walking, camping,Hiking, Riding a bicycle or other environment,When LED lights is ON, please DON'T look straight. Specification: Material: Electronic component Color: Black Voltage: 3.7V Power: 5W Switch type: Press Charging: USB Battery: 2000mAh Luminance: 350 lumens Size Chart: 15.5x11x7cm/6.10x4.33x2.76inch Package Includes: 1 Piece Running Light 1 Piece USB Cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!