1. [Durable and waterproof] The backpack is made of nylon+PC+ABS fabric. It provides strength and long-lasting performance. (Backpack size: 36*21*12cm)2.4 LED Turn SignalsWith LED luminous display panel, there are 4 Led signals: left, right, forward, stop, from turn signal to emergency signal, reminding the driver to keep distance. And provide a safer warning effect in foggy weather at night.3. [USB rechargeable battery] 500mA rechargeable lithium battery (built-in), USB charging (with charging cable).4.Wireless Remote ControlConnect the wireless transmitter to the handlebars of your bicycle for easy control, adjustable shoulder straps and waist to fit your body perfectly.5. [Application] Suitable for cycling, camping, hiking, hiking, outings, and daily leisure.describe:Material: nylon+PC+ABSProduct size: 36*21*12cm / 14*8*5 inchesConnection method: wireless frequency 2.4hzControl distance: 3MWorking hours: 12-15hCharging time: 3HRemote control battery: 2*CR2032 (built-in)Receiving battery: 500AH lithium batteryInstruction type: turn left, turn right, forward, stop, standbypacking list:1*LED indicator light package1*remote control1*card holder4*tie1*USB cable