1.Direction Indicator Keeps You Safe on the Road h reflective strips and LED lights. The LED will respond to signal received from remote controll er, which will remind passengers and drivers keep distance from you. This LED reflective bag accessory can be easily assembled on your own cycling backpack. It`s just a foam panel that attach to a bike backpack. Absolutely a perfect add-on for road cycling. Wireless control, safely use when riding.Tied or mounted the wireless transmitter on the bike, so you never has to take their hands off the handlebar. It can be used as a wireless bike turn signal light. Please press the "Yellow" botton on remot e to turn off when you do not use it. If battery run out,please change a new 2032 battery. It has 3 Led signals: left, right, stop, from turn signals to emergency signals, to reminder drivers for keeping their distance. If you stop to use the LED Signal Vest,please press "Power" botton to turn off. Recharges from your computer or any device with USB port, no more money wasted on batteries again. Specifications: Specifications: Product: luminous safety vest Wireless frequency: 2.4 GHz Product dimensions: 250*250mm Colors: yellow and gray Material: nylon Enclosure material: PC+ ABS Communication mode: wireless frequency 2.4GHZ Control distance: 3m Backpack/pendant: waterproof fabric Working time: 12-15H Charging time: 3H (with LED indicator) Remote control battery: 2 xCR2032 (built-in) Receiving battery: 4.2V,