The Mainstays rechargeable clip fan in black with a 4" blade diameter is the perfect solution for cooling your personal space in the home or office. With three fan speeds ( high, medium, low) and an adjustable air out angle, it can suit all your air movement needs. It has the option of being clipped to the edge of a surface or used as a stand alone fan. It is dual powered with a 2000mAh battery / USB with cord included. Lightweight for portability with a whisper quiet operation,this is the perfect fan for people on the go.