Turn signal function: the unique turn request function improves your driving safety. The energy-saving high-brightness LED in the middle of the taillight is red with extremely high brightness. The yellow LED lights on both sides are arranged in an arrow shape to inform the vehicles behind your direction in time. USB rechargeable bicycle rear light, it will turn off automatically when fully charged. It can save you a lot of battery cost. Built-in 500mAh lithium battery, 2 hours per charge, 2 hours of use 4 modes: long light, slow flash, ordered flash and strobe. The remote can be installed on the handlebar, and the lights can be easily controlled using the 4 buttons on the remote. Super waterproof, the shell of the lamp is made of high quality ABS and the airtightness is strong.You can ride freely in rainy days. Easy to use: use silicone holder. It can be installed on all bicycles, mountain bikes, racing cars, handlebars, seatposts, dog collars or others. It can also be used as a helmet, backpack, indicator light, etc. Product Description Detailed Description: Material: ABS + meta Battery: 500mAh Charging time: 2 hours Discharging time: 2.5 hours Voltage: 3.7 V Color: red light Mode: brake warning, turn signal Size: 85*20mm/3.34*0.78in Main light function control: One click: the main light turns on and enters long-time lighting mode. Click again to enter slow flash mode. Click again to enter flash mode. Finally click it to turn off the main light Left button: click, left turn signal flashes 5 times Right button: click, right turn signal flashes 5 times Parts list: 1X bicycle taillight 1X remote control 1 USB cable