it's a 12x12x8mm Tactile Push Button 40xx package. The pins are normally open (disconnected) and when the button is pressed they are momentarily closed.
- Up to 1 Million operations
- Actuation force of 1.6N to 2.5N
- Small PCB footprint
- Low profile
- 0.25 Actuation travel
- Operating temperatures of -35° up to +85°
- Switches | SPST Switches | Tactile Switches | Push Button 40xx | 12mm Button | Momentary switch | 4 pin Tactile Switch |