Name: Digital Hand Warmer Color: White, Pink, Green, Black Size: 10.8*4.5*7.5cm Battery Cell: Lithium-ion Battery Battery Capacity: Large Capacity Battery Charging Time: 5±1h Working Hours: 2.5-12.5h Product Weight: 240g Features: 1. It Is Lightweight And Can Be Carried On An Airplane. Whether It Is Held With One Hand Or Carried In A Pocket For Travel, It Is Easy And Burden-free. 2. Say Goodbye To Battery Anxiety, Turn Into A Power Bank, Large-capacity Battery, USB Output Capacity 3. PI Carbon Crystal Heating Technology Releases Infrared Light Wave Radiation Heat, Which Is Close To The Wavelength Of The Human Body And Easily Penetrates The Skin And Is Absorbed By The Human Body. 4. Long Battery Life, Constant Temperature Heating On Both Sides, Rapid And Even Heating On Both Sides, More Warmth 5. Four New Colors, Various Shapes, Suitable For Different You, There Will Always Be One You Like.