Hand Warmers Features：Mini portable The cobblestone shape fits your palm Pocket size to carry with you 

Electric Hand Warmer Power Bank Double-sided heating Up to 5—8 hours when warm（according to power usage and storage conditions） 

USB compatible with multiple devices Quickly heat up in 5 seconds, warm your hands faster 3 heating levels with operation indicator 

Product size: length 4 inches, width 2.36 inches, thickness 0.94 (there is a slight error due to manual measurement, but the error is very small) 

Packaging and accessories include usb Hand Warmers Rechargeable×1, charging cable×1, user manual×1