iHuniu LED Turn Signal Light Reflective Vest Backpack/Waist Pack/Business/Travel/Laptop/School Bag Sport Outdoor Waterproof for Safety Night Cycling/Running/Walking The Safe Led Signal Pack for Running, Cycling, Walking USB Rechargeable,save power. Built in lithium Battery,easy to charge the pack. Wireless control,safely use when riding.Tied the wireless transmitter on the bike,so you never has to take their hands off the handlebar. The wireless signal does not interfere with each other, if Multi-user are using it at close range concurrently. It has 4 Led signals: left, right, forward, stop, from turn signals to emergency signals, to reminder drivers for keeping their distance.