Specifications: 1. Item:seenDa 4port USB Hub 2. USB Version:2.0 3. Cable Length:0.45m 4. Support system: Mac/Vista/Windows 5. Support Devices: Cellphone/Tablet/USB Driver/OTG/PC/Laptop 6. Size:76*24*24mm 7. Material: ABS 8. Shell manufacturing technique: Polished Alloy, Anti-skip,anti-fingerprint Features: 1. USB binding 2.0 chip, high-speed chip. 2. (Hi-speed) USB2.0 interface, theoretical maximum speed up to 480Mbps, and backward compatible with USB 1.1/1.0 standard specifications 3. Equipped with four sets of USB jacks with a hot plug function 4. Current protection function, support overload voltage, and instantaneous current protection function, safe and convenient to use 5. Work output is stable 6. Working humidity: 10% - 90% 7. Working voltage: 5V 8. Working current: 500mA 7. Working temperature: -20C - 75C 8. Storage temperature: -40C - 85C Package Includes: 1*4 Port USB Hub