Describe: 1. Rotate HUB USB rotating HUB, suitable for notebook expansion, light and convenient, super inclusive, high-speed transmission, 100% brand new and high quality. 2. 3-in-1 port and super inclusive expansion of 3 USB ports, no driver required, plug and play, fully compliant with USB 2.0 specification. 3. Strong inclusiveness Suitable for smart phones, digital keyboards, hard drives, card readers, USB mini fans, USB coolers, keyboards, old mice and other computer equipment. Specification: Working humidity: 10% - 90% Working temperature: -20C - 75C Storage temperature: -40°C - 85°C size chart:Dimensions: Approx. 50 x 43 x 18mm/1.97x 1.69 x 0.7 inches Package package: 1 USB HUB with 3 ports Notice: All dimensions are measured by hand and may have slight deviations. Colors may vary slightly due to individual monitor color settings. Each enables or disables the use of each port. Thank you for your understanding. Please enjoy your happy shopping time!