S4/C, the 4-color pad printing machine has a conveyor and an operation that is microcomputer-controlled. It has a built-in four-digit auto counter as well. The sturdy coin aluminum structure has a long life. The machine has an independent pad stroke and speed control. To obtain a thicker ink covering, inking is done twice, and printing once. The ink is covered by an ink roller. The printing speed can be adjusted to meet different requirements. The maximum printing area is 85×130mm. The 4-color printer can be used for small round and flat surfaces, such as cell phone buttons, toys, pens, PC mouse, and small electronic accessories.