The cooling fan prevents the phone from overheating when you play mobile games and can extend the life of the phone and the phone’s battery.
Item Name: Phone CoolerMaterial: PC, Aluminum AlloyUse Time: 4 HoursCharging time: 1 HourBattery Capacity (Rechargeable Style): 300mAh (Included)Input Voltage/Current: 5V/1-2ASpeed: 4000rmpCharging Interface: Micro USBFeatures: Portable, Fast Cooling, Light Effect, MuteSupported Width: 62mm – 85mm/2.44′′ – 3.35′′ (Approx.)Cooler Size: 8cm x 4.5cm x 2.8cm/3.15′′ x 1.77′′ x 1.10′′ (Approx.)