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Parameters:Rated voltage: 5VRated power: 3WNoise: less than 36dbSpeed level: level indicator: 1-4 levels, the wind force is stronger level by level. Undervoltage protection: When the battery voltage is lower than 3.4V, the red indicator light flashes quickly. When the voltage is less than 3 V, the mini fan will shutdown automatically. Power mode: USB charging red light: flashing during the charging; always on when it's fully charged; charging time: 6-8 hoursBattery: 18650 2500mAhWorking hours: under the strongest level: 2.5 hours, under the weakest level: 6 hoursUSB cable length: about 70cm/27.56in Product size: about 145*183*114mm/5.71*7.20*4.49in Product net weight: about 278g