The Firstgear Heated Jacket liner is made from lightweight thermal materials to fit perfectly underneath your jacket or just worn on its own when weather permits. Powered by a 12v lithium ion battery, you can heat your core up in seconds with 3 different heat levels while on or off the bike. You can also plug the liner directly to your bike to save your battery's power supply and recharge. Pairs great with other Firstgear heated gear such as gloves, pants and socks all controlled in sync.; Lightweight polyester Micro alloy heating elements High, medium, and low heat levels Built in heat controller button Can be combined with other Firstgear heated gear such as gloves, liners and socks Connects to your bikes 12v power system Includes wire harness for easy connection to vehicle's battery Large back storage pouch Lithium-Ion (model 615b), 12.6v battery included Battery charger specs: 110-240v Input, 12.6V DC, 2.5A Output