Product Specifications: -Have on / off button -Has charging cable With lanyard -Power: 250 mAh -Charging time: 2-4 hours with 1 A charger (fast charging head is not recommended) How to Use: -Press The on / off button to blame the fan -Put the round charging head into the back of the fan, and insert the USB part into the laptop head, computer or charger.-Charging Head, with 110V-240V voltage and 5V output cable, suitable for charging