Slim heating film,only 0.13mm. USB plug with extension cords,simple and convenient and safe. Professional gloves special fabric design, elastic, breathable, fashion.This product is not waterproof, please do not use in rain. Constant temperature , keep your hands warm in winter. DIY creativity, easy to install, just stick on handlebars. Usage :Only need to connect this product to your car 2.1A 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. Specifications: Material: Neoprene Qty: 2pcs/pair Rated Voltage: DC 5V Power: 15W Heating Temperature: 55-65 Celsius Wire Length: 1M USB Input Current: 2.1A Max Suitable Handle Diameter: 22-30mm Package Included : 2 x heated grips covers (with connection wire)