These are 4-pin DIP through-hole momentary tactile switches.
They are used to provide a control signal input to various electronic devices, such as household appliances, digital products, and industrial equipment.
They are momentary switches, meaning they turn on only when pressed and off when released.
The switches provide haptic (tactile) and often audible feedback to confirm user input.
They feature a high-precision mechanism designed for a long service life.