The product is made of aluminum alloy and ABS material, which is beautiful and hand feels is good. ^^ In addition to being used as a numeric keypad, it can also be used as a HUB. The two expansion interfaces are USB 3.0, which transmits 5Gbps per second and is compatible with a variety of devices. ^^ 34-key design, a good helper for number input processing. ^^ Support theoretically the maximum distance of 10 meters, more convenient and flexible to use. ^^ Type c to type c public data line USB 3.1G en2 does not recognize the direction of anti intrusion, directional accessibility to quickly read data.