The U-Trak is the only active low 3" arcade trackball designed for mounting in a wooden panel (0.75 inch or 19 mm thick) with no plate or mounting kit. 6 Bearing races and 3 stainless-steel shafts grant smooth movements and professional durability. Color: translucent red, installation depth: 53 mm (2 inch). Pinout: Plug A) 1 - red - 5 V, 2 - black - GND, 3 - purple - X1, 4 - blue - X2, Plug B) 1 - red - 5 V, 2 - black - GND, 3 - yellow - Y1, 4 - green - Y2. Included are: Trackball and a trim flange. An USB 2.0 interface can be bought separately.