This product must be connected to a mobile power supply when the temperature is raised, and it will automatically stop heating after plugging the socket, which is sr and not inductive. Power by USB. Humanized heating battery design, cold batteries on rear design heating area. Infrared heating, no harmful radiation. One-touch heating, three-speed temprature control, smart heating. Quickly mounts the temprature in a minute to keep warm. Convenient power interface with waterproof insulation treatment. The polyester fabric is comfortable, windproof, warm, antistatic, thin and close to the body. Suitable for outdoor sports. -paule:42.7cm---Length:69cmM----Bust:118cm-----paule:43.9cm----Length:71cmL----Bust:122cm----paule:45.1cm- ----Length:73cmXL----Bust:126cm----shoulder:46.3cm----Length:75cm