The TS-1069-A1B3-D4 is a tactile switch manufactured by Yuandi with SPST (Single Pole Single Throw) contacts, a 3.50mm pin gap, and ROHS compliance. It is widely used in a variety of applications such as as various switches, encoders, buzzers, and relays, to provide tactile and audible feedback when making a connection. The switch is composed of a plastic body, metal dome, and electrical contacts, and its design is intended for long-lasting use.