USB Cooling Fan Feature: Portable Laptop/PC USB Cooler Cooling Fan. Ultra-quite design. Pitch angle can be adjusted upwards or downwards. With key switch. USB Powered, no external power required. Plug and play, easy install. Durable soft fan blades make you free of injury. Super mute. USB transformer can be purchased on its own power supply ,the proposed purchase of 5V ,1000MA transformer above. Personalized multi-color options. Air volume comfort ,close to use ,all seasons. Notebook and PC cooling fan may be taking. Specifications: USB Power Plug Body size :149.73 x 96.3 x 146.5mm Fan diameter : 96mm Power supply :DC5V Power consumption :2.5 0.25W Wire length :1.2m Package included: 1 X USB Cooler Cooling Desk Mini Fan