There is a rear light for riders of bicycle to make them safe at night. It has three flashing mode to catch people's attention, and the function of remote control makes the use convenient. Features: Wireless remote control and bright LED tail light are combined perfectly together to get drivers attention from blocks away, due to it's turn signal and various flashing modes. To allow drivers keep a safe distance from getting too close, the mode is a big help, it protects you by providing a safety range with others. 2000mAh USB rechargeable battery allows the rear light work continuously up to 8 hours in flashing mode. The light detection system would turn off the lights automatically during the day and turn on at night. There are three flashing modes, flashing, constant and cross-flash. Two way to fix the rear light, the saddle bottom or the standpipe above. Specifications: : Material: PC + ABS Color: Black Brightness: 80lm Waterproof Grade: IPX4 Taillight Size: 110 * 27mm / 4.33 * 1.06in Remote Control Size: 45 * 35mm / 1.77 * 1.38in Package Weight: 285g / 10.05oz Package Size: 13.7 * 12.9 * 4.3cm / 5.39 * 5.08 * 1.69in Package List: 1 * Rear Light 1 * Remote Control 1 * Charge Cable 1 * Tube Mount with Screw 2 * Seat Post Mount with Screws 1 * User Manual