"Small Cooling Fan" also got rid of the shackles of the power supply, built-in rechargeable battery of environmental protection, as usual hair 15 hours after the blackout, so fans regardless of location and environmental constraints, can continue to be used in the absence of power. Multi-stage air volume "Small Cooling Fan", ECO wind power use 15 hours, ultra-quiet operation and so on. The ultra-low speed 150 revolutions per minute it than the traditional fan speed lower by about 2.33 times the volume of only 32.8 db operation, "Small Cooling Fan" lower than traditional fan about 10 decibels, quieter, like a whisper softly like volume, ensure the user's sleep quality and health.