This is a two position vertical slide switch, manufactured by Vishay, part number 357B2103MAB251P22. It is a 4.2 x 2.8 mm body size switch, with actuator in common terminal. It is rated at 25mA, 12V DC and has a maximum contact resistance of 75mOhms (initial). It is designed with a built-in wiping unit, and is made from ABS plastic material. This switch is used for various industrial and consumer applications.