How many volts of power adapter does the waist belt use? According to the inquiry information, the AC power supply is converted to 12V DC power supply output, and it is necessary to distinguish the positive and negative poles, so the waist warming belt 12V 5a power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances. The working principle of power adapter is changed from AC input to DC output. According to the connection mode, it can be divided into plug-in wall type and desktop type.