Features1Lightweight backpack with reflective strips and LED signal lights for higher visibility and safety at night. 2Wirelessly control 4 signals (Left, Right, Forward, Stop), reminding passengers and drivers to keep distance. 3Recharges from your computer or any device with USB port, no more money wasted on batteries again. 4Tie the wireless transmitter on the handlebar of your bike for easier control. 5Adjustable shoulder and waist straps to fit your body ly.SpecificationThis backpack with reflective strips and LED signal lights is highly visible and safe at night. With a remote controller, this backpack can respond to the signal received, which can remind the passengers and drivers to keep distance. It is for running, Cycle, jogging and walking. Features:Lightweight backpack with reflective strips and LED signal lights for higher visibility and safety at night. Wirelessly control 4 signals (Left, Right, Forward, Stop), reminding passengers and drivers to keep distance. Recharges from your computer or any device with USB port, no more money wasted on batteries again. Tie the wireless transmitter on the handlebar of your bike for easier control. Adjustable shoulder and waist straps to fit your body ly. Specifications:Material: Nylon + polyester Color: Green & Black / Grey & Dark Green (optional) Size: 21 * 21cm / 8.3 * 8.3in Weight: Approx. 200g / 7.0oz Controller:Signal Frequency: 2.4GHZ Control Range: 3 meters Battery: 2 * CR2032 Waterproof Grade: IPX-5 Receiver Battery: 3.7V 850mAh lithium battery Package List:1 * Backpack 1 * Remote Controller 1 * Band 4 * Zip Tie 1 * User ManualPackage List1 * Backpack 1 * Remote Controller 1 * Band 4 * Zip Tie 1 * User Manual