Features5 built-in fans (1 x big fan: 140 mm, 4 x small fan: 60 mm)5 adjustable height settings for comfortable experienceNo external power supply needed and no software installationRainbow LED illumination with ON/OFF button2 fan speed modesCompatibility 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 White Shark GCP-29 Ice Master 4 Fans Cooling Pad  Laptop 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.