SAMAZ LED Wireless Bike Security Vest W/turn Signals - Bicycle Cycling Safety Light Jacket (Backpack Not Included) Material: Waterproof Nylon + Oxford Fabric Main Function: turn signal presentation on the back while cycling, riding, hiking... Transmission distance: 3 meters (depending on the surroundings) Rechargeable Lithium battery included LED turn signal, perfect for bicycle pilot, sports lovers, riding at night or more