USB interface connects to mobile power supply, safe and secure; long press the power button to turn on, short press to switch gears, 3 levels of temperature can be switched, when the blue light is on, the temperature is a constant temperature of 45°C, when the green light is on, the temperature is a constant temperature 35℃, the temperature is 55℃ when the red light is on; Suitable for: Suitable for pets to provide extra warmth in winter, also suitable for pet owners to use on chair cushions, foot pads, etc.; Gentle mode wash/machine wash, please cover the USB cable with waterproof plug. Expanded size: 39*29.5cm, folded size: 29.5*19.5cm