USB Powered with on/off switch. Super Quiet. Light weight. Works for all laptops! Keep your notebook cool! This cooling pad for notebooks features a large 230 mm fan for easy thermal heat dissipation, keeping your notebook from getting too hot. Simply plug into your USB port and you"re ready to go. It can be used either as a buffer for mobile users to isolate the hot bottom of laptop from your lap or keep your laptop cool if it is used as your main computer sitting on a desk running most of the day. Specifications : Front fan On/Off switch for easy access. 1 large 230mm quiet fans for quick heat dissipation. Powered by USB bus, No additional AC adapter is needed. Light weight (1 Pound), and with only 0.5" (14mm) of thickness, easy to carry. Compatible with all types of laptops with a USB port. Air Flow: 30 CFM Speed: 3000 RPM Noise: 21 dBA Current: 0.26A Voltage: DC 5V Power: 1.3W Package Includes : Notebook cooler pad USB power cable