Microphone, Train 4.5V 4 x 4 x 2 with Vertical Plug Sockets

Reference

upn0311b

BrickLink® #

x869b

Microphone, Train 4.5V 4 x 4 x 2 with Vertical Plug Sockets (part upn0311b) is a LEGO element. It appears in 4 sets, including Electronic Control Unit (Forward - Stop) and Electronic Control Unit (Forward/Backward - Stop).