Air cooler: Get a mini air conditioner unit in green or white! Designed to: Designed to cool and clear the air with its 150ml water tank. Rechargeable: Charges via a USB cable that comes included. Quiet: Whisper-quiet so you can use it during sleeping. Modes: With three different modes to provide different levels of cooling. Use: Runs for up to eight hours per fill. Mini Air Conditioner Unit | Green | Living Social