This is a Rectify Series drop-in speaker system for Athearn Genesis SD70ACe locomotives. The speaker has two pins that locate the system in the frame, just like the stock speaker. A single screw-removal is all that is needed to remove the stock speaker/frame. This system then simply drops-in with carpet-tape or a touch of adhesive keeping it in place.
The speaker comes fully assembled and tested.
Overall dimensions are 30mmH x 15.5mmW x 28mmL