Macna Cloud Black Heated Body WarmerAn electrically heated base layer vest, developed for riders in cold conditions. The Cloud is for riders who think a heated jacket is a bit too much and are only looking to heat their core. This jacket is also suited to be worn as stand alone garment during outdoor activities such as fishing and hiking. Dual Power Technology lets you choose between a 7. 4 or 12 Volt power supply. Power can be supplied by a battery in the pocket or a direct connection