[TIPS] 160x170mm circumference (Stretchy). Have to be plugged in during use. Input Voltage: DC 5V. The USB cable can be ripped from the middle. Thus adapting to your working range | [SAFE 5V USB POWER SUPPLY] : safety power is quite user-friendly and also easy to access, simply plug it onto USB port of PC, power bank, charger or other 5V power sources.Hip-and-young design brings you more than warmth but the fashion. Have to be plugged in during use. | [COMFORTABLE HEATING]: Heating temperature at about 40(±5）°C, which is the most comfortable range for human body, you won't feel dry hurted by the overtemperature with ours. | [WIDE APPLICATION]: Used arthritis heating pad and under scores of occasions in winter or cold autumn, suitable for gaming, typing, operating the mouse, and more other situations such as work, play, skiing, riding, hiking, outdoor exploring, etc | [WARM YOUR HANDS IN COLD DAYS] : This gloves with heating pad keep your hands back always warm, brings no effect for your hands movement when you work or study front of computer. | [ELASTIC FABRIC FOR SNUG FIT] : Knitted from quality fabric, ultra-soft and elastic, fits snugly yet offers excellent flexibility to ensure your hands and fingers free to move. Delicately knitted and hemmed makes it sturdy and durable for years’ use.