This professional warmer is made of special fabric design which is elastic, breathable and fashion. You only need to connect this product to your car 2A USB charger or power bank, and will be heat up in about 15 seconds, it will keep your hands feel warm of the whole winter. But it is not waterproof, please do not use in rain. Features - Color: Shown in the pictures. - Material: Neoprene. - Size:Approx. 14 * 10 * 1cm/ 5.5 * 4 * 0.4 inch (L*W*H). - Rated voltage: DC 5V. - Power : 7.5W. - USB Input Current:2A Max. - Heating temperature: 45-55 Celsius. - Wire length: 1M. - Suitable handle diameter: 22-30mm. - Slim heating film, only 0.13mm. - USB plug with extension cords , simple and convenient and safe. - Constant temperature , keep your hands warm in winter. - DIY creativity, easy to install, just stick on handlebars. - Heating fast, can quickly feel the warmth in 15 seconds. - Fitment :Apply for Car <do a test before use>,Motorcycle, Scooter, Mountain bike etc. - Important notice: The connect wires might car steering wheel, if you want to use it for car steering wheel, make sure do a test when the vehicle is stationary state,ensure traffic safety. Package list: 2 x heated grips (with connection wire and )