Any switch can be welded, and the switch can be designed by DIY. It can be set as a mouse, button, string, multimedia, macro definition, etc. through the software This product provides a key definition setting software based on / system, which can be used in systems after setting The IC in the USB greatly improves the anti-interference ability, so increasing length has little effect on the performance of the product Applicable to mobile phones, computers, various software APPs, and a wide range of applications After connecting the switch line to any switch, the switch can trigger the set key value through the chip in the switch line. Colour:Black Material:plastic Specification: C:4 cores connected to 3 switches Package Contents: 1 x USB Pigtail Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.