About this item ★ Indoor + Outdoor: Designed to provide extra warmth for luxury 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. ★ One minute heat cycle between 40-60. There is a temperature control chip in the heating plate, which automatically cuts off power when it is higher than 65 degrees and automatically heats when it is lower than 40 degrees ★ Easy to Care: Can be easily treated, machine washable and roller dried. Please disconnect the power cord before washing or drying. ★ The recommended output power is 5.0V-12V/2.0-3.0A. Not applicable to ambient temperature below 55°F. Low voltage safety: 5V-12V/2.0-3.0A standard power output with waterproof cable. ★ USB power connector and extension cord give you a more free experience. Only Central Heating: Lightweight and invisible,built-in carbon fiber heating pad can be used by mobile power, laptop, car USB adapter.