Easy and convenient to use which means you can just directly put it into your jackets, vests and other clothes for warming and heat it by using 5V 2A power source, such as computer, power adapter or power bank(not included). Having a wide application area including for clothes, vests, waists, abdomens and so on. Lightweight and portable so it is very convenient to take with for outdoor camping or other activities on winters. Applicable to the people who are afraid of coldness, and they will do not fear of winter any more with it. Item Name: USB Heating Pad Material: Composite Fiber Power Supply: USB Charging Adjustable Temperature: 45-65 Degrees Celsius Button: Red Light(High Temperature 55 Degrees Celsius), Blue Light(Medium Temperature 50 Degrees Celsius), Green(Low Temperature 45 Degrees Celsius) Features: USB Charging, Convenient, Safe to Use, 3 Gears Size Details: 8 in 1: 8cm x 12cm/3.15" x 4.72" (Approx.) 4 in 1: 8cm x 16cm/3.15" x 6.30" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x USB Heating Pad(Others Not Included)