These are Rectify Series drop-in speaker systems for Rapido GMD-1 locomotives. The speaker uses a bit of tape or adhesive to secure and no modifications are needed to replace the factory speaker.
 
TWO VERSIONS:
 
The RAPO-GMD1-RC1 fits the previous runs using the iPhone 4 speaker.
 
The RAPO-GMD2-RC1 (UFIT-0730) fits the current version using the small "twin-cube" speaker mounted to the PCB. Please see the third set of photos for installation instructions.
 
The speakers come fully assembled and tested.
 
Dimensions:
RAPO-GMD1-RC1: 6mmH x 16mmW x 45mmL
RAPO-GMD2-RC1 (UFIT-0730): 7mmH x 16mmW x 30mmL
 
VIDEO: https://youtu.be/2l2vszODzOY