The metal foot pedal frees up your hands to perform other procedure whilemake the operation in control with your foot. It can be used as keyboard,multimedia function, character string and B-ultrasound scanner. Features: Defined function via the USB switch. Durable metal material. Built-in electronic circuit. Great anti-interference performance. Waterproofand high quality. Quick response saves your time. TPU foot pads keep stable without slipping. It is widely used in medical sector and industrial equipment. Note: It ONLY supports Windows. It can be used for Linux, Mac and Androidonly after setting the fucntion. Specification: Material: Iron alloy Color: Black Cable length: 2m Item size: 11.8 * 7.6 * 2cm / 4.65 * 2.99 * 0.79in(L * W * H) Item weight: Approx.350g / 12.35oz Package size: 13.2 * 9.5 * 5cm / 5.20 * 3.74 * 1.97in(L * W * H) Package weight: 389g / 13.72oz Package List: 1 * USB Metal Foot Switch 1 * CD Drive