Features: brand new and high quality Metal house makes the switch box with good dissipation. It's widely used in the securities market, education and communication field. DB9 pin Serial Port: It's suitable for DB9 pin port devices Manual Share Switch Box: No need to unplug and plug in wires when changing from different serial devices such as printers, computers. Suitable for 2-way computer RS232 interface switching, 2 In 1 Out. Specifications: Material: metal for shell Size: approx. 12x9x3cm/4.72x3.54x1.18in Note: Light shooting and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3cm. Package includes: 1PC x 2 input 1 output Switch