Elecguru Bicycle Tail Light, Wireless Rechargeable Remote Control Waterproof LED Warning Flashing Turn Signals Bicycle USB Chargeable Laser Rear Light for Bike Wireless Remote Control- Wireless remote controller allow you to operate the tail light easily during riding, and you don't have to bend over to turn on/off the tail light any more. USB Rechargeable with 2000mAh batteries- Equipped rechargeable 18650 battery and USB cable, easily charge with cell phone DC 5V charger and power bank, no worrying tail light battery replacing, save money and environment friendly. Automatically turn on/ off- Power on: if it's daytime, the tail light will be turned off by itself, if you pass through the tunnel or in night environment, the tail light will automatically light up. Easy to install and use- Durable and resistance to sunshine, rain and shake. Removable buckle make tail light easy to install and steady fixation. Red light intensity: 80LM , * Laser light safety distance: 5M , * Waterproof: IPX4