It ia for 12v and goes in a fancy gold frame containing the 10w halogen reflector lamp. Now converted to LED reflector lamp.
The switch is similar to
a rocker type, but with no surrounding lip, just the brown rocker's knob pokes through the frame. The rear of the switch is rectangular, rather than round and sort of clips into two small lugs formed in the metal of the frame. Rather than spade terminals it uses push in terminals for the bare (soldered) flex ends. The rocker toggle is about the same size as the above linked item.
It pushes into the lugs from the rear, and wings on the switch prevent it being pushed to far out through the frame.