I recently acquired this set and had a blast constructing them! They are not for the faint of heart...Cutting, shaping, soldiering ETC is required throughout!
The communicator is based on the "GAMMA" prop seen in the original series. Most famously in the Making Of Star Trek Book.
It is Non working...which is fine by me. 

The Hand Phaser features a raising site and extending emitter that lights when the thumb wheel is rotated.
Again, I didn't want idealized props but went for a weathered and used looking effect.

These are way out of production kits from J Long.

Thanks!