Features: warm and stylish; made of super soft polyester fiber. USB power connector and extension cord give you a more experience. Central Heating: Lightweight and invisible,built-in carbon fiber heating pad can be used by mobile power, laptop, car USB adapter, USB socket charger, USB hub, MicroUSB mobile phone charger. Recommendation (5V-12V/2.0-3.0A output power). Indoor + Outdoor: Designed to provide extra warmth for travel, office, home, outdoor and vehicle use. It has a portable function and generates a reasonable amount of heat according to the USB power limit. The recommended output power is 5.0V-12V/2.0-3.0A. Not applicable to ambient temperature below 55°F. Easy to Care: Can be easily treated, machine washable and roller dried. Please disconnect the power cord before washing or drying. Low voltage : 5V-12V/2.0-3.0A standard power output with cable. Material:polyester fiber minute heat cycle between 40-60 There is a temperature control chip in the heating, which automatically cuts off power when it is higher than 65 degrees and automatically heats when it is lower than 40 degrees