A Single Pole Single Throw (SPST) switch is a switch that only has a single input and can connect only to one output. This means it only has one input terminal and only one output terminal. In this product, there are two input and two output pins.
Tact switches are commonly used in many consumer electronic devices. They have a small footprint and come in many sizes and gram forces. A tact switch is an on/off electronic switch that is only on when the button is pressed or if there is a definitive change in pressure. Another way to consider it, as momentary make or brake switch. As soon as a tactile switches button is released, the circuit is broken.
Note: Normally Open