Product information: Power type: USB Noise: 46-70db Color: white, gray blue Energy efficiency level: Level 1 Rated Voltage: 5V Air supply method: No page turning, no shaking head Rated Power: 5W Operation mode: Mechanical Timing function: no timing Rated frequency: 50Hz Style: USB plug-in type, 4000 mA rechargeable Appearance size: 205X 189X 128mm Applicable scenarios: kitchen, office, dormitory, bedroom, living room