Compatibility for all laptops with screen size up to 17.3 Inches with 5 Built-in fans (big fans: 140 mm, small fan: 70 mm) with red led lights. This ergonomic stand comes with two adjustable height settings for the most comfortable experience while playing games or watching movies. Just simply plug and play with no external power supply is needed, no software installation is required. Features and Benefits Built-in Fans - 5 built-in fans (1 x big fan: 140 mm, 4 x small fan: 60 mm). Ergonomic Stand - Five adjustable height settings for the most comfortable experience while playing games of watching movies. Plug and Play - USB 5V power. No external power supply is needed, and no software installation is required. Rainbow LED Illumination - Rainbow LED illumination with ON/OFF button on the front side of the cooling pad. Fan Speed Modes - ON/OFF button is also a mode selection button with 2 fan speed modes. Specifications USB Hub: Yes Working voltage: 5V Tilt adjustment: Yes, 5 positio