Cooling area: 40mm*40mm
Cooling unit Size: 44mm*44mm*20mm
Cooling unit Weight: 42 g
Cooling  power max: 10 watts, for comparison, a typical air conditioner consumes 700 and 2,000 watts
Battery last 1~1.5 hr (continuous cooling)
Total weight: 80 g
Wrist band is elastic and washable
Default wrist band suitable for wrist circumference: 14-18 cm
Suggested to order together with Extra large wristband for bigger wrist circumference.