Feature 1 Intelligent temperature control heated with knees back and waist 2 Powered by any 5V 2A USB portable charger the USB plug is compatible with most portable chargers on the market 3 Which can start heating in 30 seconds long duration and long heating time 4 3 level adjustable temperature with indicator light to adjust the required temperature 5 Safety insulation design built in thermal protection module 5V safety voltage once overheated it will stop running until the heat returns to the standard temperature 6 Support manual machine washing The safety protection function ensures that the machine is not damaged during washing 7 Heating underwear helps to improve blood circulation enhance metabolism which is very suitable for people who are afraid of cold Raynaud s disease arthritis poor blood circulation and stiff joints 8 The best solution for various outdoor activities such as skiing fishing jogging Hunting biking hiking motorcycles protecting climbing dogs Running snow removal etc Specification Name Heated Thermal UnderwearMaterial 95 Cotton 5 Spandex Velvet Lined Carbon fiber wireColor Black GrayGender Men WomenSizeWomen S M L XL 2XL 3XL 4XLMen M L XL 2XL 3XL 4XL 5XLHeating Zone4 heating area Underwear suit Women left right knee back abdominal feverMen left right knee back hip feverHeating temperature Red Light Warm 50 ℃ 122℉ Blue Light Comfort 40 ℃ 104℉ Green Light Energy Saving 30 ℃ 86℉Power suppl