2. Surface Material: Metal 3. No external power required 4. No software installation required 5. Compatible with USB 1.1 and USB 2.0 6. Cost-effective for small business and home to manage network layout 7. You can share your USB device such as printer or scanner with up to 4 computers 8. Share one USB device between four computers without manually switching out cables 9. Switch buttons in push-button form displayed on the front of the switch for each access for switching from computer to computer