This is a Rectify Series drop-in speaker system for Life-Like Proto 2000 SD50/60 locomotives. The system requires removing the dynamic brake fan detail and it nestles into the weight cavity the fan occupied. This is a fast, simple way to add sound to these locomotives without modifying the frame.
Note that a system this small doesn't provide much of a bass-response. I generally recommend the weight be milled for a larger UFIT system in the rear and using this system as a second speaker in the front.
The speaker comes fully assembled and tested.
Dimensions are: 10mmH x 18mmW x 19mmL