Unifire&reg; Mini Personal Fan Portable USB Rechargeable Mini Bladeless Handheld Air Conditioning Fan Bladeless Portable Refrigeration Fans with Stand Sports Cooling Fan (blue) Built-in sponge for absorbing cool water and freeze to generate cool breeze. Material: durable hard plastic and soft sponge. Powered by inner battery with a white stand. Super Mini Bladeless design; You can hang it in your neck when doing outdoor sports. Great for cooling air in office home or out door activities. More safety and convenient.