Description 1 Infrared fever neck back heating2 Imported carbon fiber yarn safe no radiation heat and temperature long service life3 One button heating three speed temperature control there will be light changes4 Infrared heating no radiation built in heating module intelligent heating5 Waterproof process design safe6 Humanized heating part design7 Long lasting fever long battery life 10000mah≈8hours8 After unplugging the power supply it can be washed and machine washed 9 Light and close10 The heating process is a hot compress for the joint points of the human body Specification Fabric Name PolyesterFabric composition spandexColor Navy Black RedSize M L XL 2XL 3XLVoltage 5VRated power 9WOperating temperature range 5 °C 40 °CApplication Unisex outdoor everyday leisure How to use Instructions1 Open the pocket and connect the USB connection to the treasure2 Press and hold the mark for 3 seconds to start heating3 Light shift third gear temperature adjustment4 Press and hold the logo or remove the charging treasure to turn off Note 1 This product does not include power bank2 Unplug the power machine wash hand washPackage Included 1 X Heated Waistcoat