the wind is heavy and the battery is chargeable good to use li-ion battery fan Input voltage :5v input current:0.5-1A output voltage:5-9v output power ：4.5W Battery:li-ion 18650-3.7v pls do not put your finger into the protective screening to avoid being damaged and brreaking down the machine. children under the age of 10 should use under adult supervision portable rechageable fan
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