Specifications:Built-in rechargeable battery, long using time.Free your hands. You can hang it around your neck, or fix it on the wrist or waist.Suitable for travel, outdoor sports, indoor work, delivery and so on.Item Name: USB Cooling FanMaterial: ABSType: G20 4000mAh/G30 6000mAh (Optional)Type G20 4000mAh:Battery Capacity: 4000mAh (Included)Output Power: 3.6WMotor Speed: High Wind Speed: 5000rpm, Medium Wind Speed: 4300rpm, Low Wind Speed: 3600rpmBattery Life: about 3H for High Wind Speed, 6H for Medium Wind Speed, 15H for Low Wind SpeedCharging Time: about 3-4 HoursInput: DC 5VType G30 6000mAh:Battery Capacity: 6000mAh (Included)Output Power: 3.6WMotor Speed: High Wind Speed: 5100rpm, Medium Wind Speed: 4400rpm, Low Wind Speed: 3800rpmBattery Life: about 4.5H for High Wind Speed, 9H for Medium Wind Speed, 23H for Low Wind SpeedCharging Time: about 3-4 HoursInput: DC 5VFeatures: Rechargeable, Portable, Air CoolerSize: 10.1cm x 7.7cm x 3.6cm/3.98" x 3.03" x 1.42" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x USB Cooling Fan1 x USB Cable1 x Lanyard1 x User Manual