Rechargeable Mini Fan, 6 Inch, GF21158 | 3 Speed Setting | Lithium-Ion Battery | 12 Hours Operating Time | USB Rechargeable | LED Night Light | Overcharge & Over Discharge Protection This product is a mini fan with built-in-safe. Pollution-free, memory-free. 3.7V Lithium-ion battery with rated capacity up to 4500mAh, long service life. After the battery is fully charged it can be operated for about 12 hours. The wind speed is a adjustable in three steps. The operation is a simple and quick, and the appropriate air volume can be selected according to the needs. Product configuration micro-USB socket, as the product charging input port you can directly use the mobile phone charger or adapter with USB output port to charge the product. With overcharge and over discharge protection. Trickle charge, charge status indication function The product adopts high quality motor, high efficiency low energy consumption, low noise and long service life