One point four multifunctional use, improve work efficiency. Small and exquisite, easy to wear. A single connection comprises 4 each with its own power switch. Ultra-fast full speed and decline transfers are supported. 4-port current overload detection and protection, supporting plug-and-play and hot-approved hubs and peripherals. The size is purely manual measurement, it will inevitably be an error of 1-3 cm, see the actual product. Due to the shooting light and the difference of each monitor. There are different color differences. The actual product must prevail.