5 Adjustable ventilation: customized air movement with 5 selectable speeds Choose gentle ventilation ( 1 2) for quiet relaxation, comfortable circulation ( 3 4) for work breaks, and powerful cooling ( 5) to quickly cool your space Extended action & Energy Efficient: The 1200mAh built in rechargeable battery and power saving technology provide long lasting use Reversible Charging Connection: Equipped with a reversible charging port that works with portable chargers, computers, car adapters and mobile device chargers Quiet action Technology: Incorporates advanced motor technology and noise reducing design that operates at only 35dB Distinctive Retro Cooling Design: This USB fan features a nostalgic cooling unit exterior design, serving as both an effective fan and decorative desktop item