Sony Remote RM-SRB5 - an example of simple solutions

This is a tear down of an old Sony RM-SRB5 remote for audio systems.

From a design perspective, the following points are interesting:

There are 10 mechanical parts in all: 

• top, 
• bottom, 
• battery lid, 
• pcb, 
• metal interconnect for positive and negative terminals, 
• rubber keypad, and
• four screws.

The battery lid is of a design that could be 3D printed provided the orientation of the filament is aligned to create strength if the flexing direction.