Product Description: 1. Provide 4/7 USB interfaces; 2. USB3.0; 3. Built-in current overload short-circuit protection device; 4. Adopt high quality electronic equipment to ensure stable operation; 5. Automatic computer recognition and installation, no need to drive, plug and play, plug and pull; 6. Support: windows95/98 / ME / 2000 / XP/Vista, M - ac 8.6 or higher; Product specifications: 1. USB3.0 chip, a real high-speed chip; 2. (high-speed)USB3.0 interface, theoretical maximum speed up to 5GB/S, and backward compatible with USB 2.0/1.1 standard specifications; 3. Equipped with 7 sets of USB jacks with hot-plugging function; 4. Current protection, supporting overload voltage and instantaneous current protection, safe and convenient to use; 5. Working humidity: 10%-90% 6. Working voltage: 5V 7. Operating current :500 mA 8. Operating temperature: -20C-75C 9. Storage temperature: -40C-85C The package includes: 1 * 4Ports/7Ports with switch HHB 1. Provide 4/7 USB interfaces; 2. USB3.0; 3. Built-in current overload short-circuit protection device; 4. Adopt high quality electronic equipment to ensure stable operation; 5. Automatic computer recognition and installation, no need to drive, plug and play, plug and pull;