Features:Usage: Press and hold this button for 3 seconds to turn on the machine. When the temperature is high, the output is 100% voltage and the red light is on. After 5 minutes, it will automatically return to medium temperature and the green light will be on. Press this button to control the temperature rise at medium to low. Press and hold the button for 3 seconds to turn off.Easy to use. You can use the 5V 2A power supply to put it directly into jackets, vests and other clothing for heating and heating, such as computers, power adapters or power packs (not included).Scope of application: clothes, vests, waist, abdomen, pets, etc. Please avoid using the central heating wire when sewing. The maximum temperature is 65 degrees Celsius.Foldable, with a certain degree of waterproofness, uniform heating, washable, but do not soak in for too long (stick the cloth together, longterm soaking will affect the adhesion)Lightweight and portable, convenient to carry during winter camping or other activities. This also applies to people who are afraid of the cold, they no longer worry about winter.Don't let yourself, babies or people who are not sensitive to heat. Do not use in a humid environment, please dry before use. It is strictly prohibited to use in uninhabited rooms. Specifications:Material: Nonwoven Fabric.Size: 80x120mm/3.14x4.72inch.Color: Black.Power Supply Mode: USB Charging. Input Voltage: 5V2A .Adjustable Temperature: 45C65CGear Setting: Red (High) Blue (Medium) Green (Low) Note:Please allow 12cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes:1x Kit