a (black) discarded computer mouse;
a small sound recording module (e.g. the kind used for greeting cards product ID 191184. at Conrad
a hole pattern board 10 by 5 cm (e.g. hard paper type, product ID 528404 at Conrad
about 4 cm of blank metal wire fitting the holes in the pattern board;
some (black) card/thick paper;
a piece of stiff plastic, cardboard or thin plywood about 45 x 60 x 1 mm (e.g. a piece cut from a heated discarded CD-ROM, see step 2);
some (black) duct tape;
some (low temp melt) glue (+ glue gun);
some double sided tape (can be replaced by glue and patience);
black paint for plastics, if your mouse is not black. Paint for lexan/polycarbonate model cars bodies works good.
black permanent marker if either your card/thick paper or duct tape is not black.
Something that marks on black if either your card/thick paper or mouse is black (e.g. black board chalk).
a (small) hacksaw
a drill (a drill stand or an ordinary power drill mounted in a stand makes the drilling feasible for the younger tinkerers)
a drill bit about 5 mm diameter
a flat file or sandpaper on a piece of wood
a kitchen oven.
a computer and the original Star Trek communicator chirp sound on file (see step 5 for links).
Optional but handy tools:
some (speed) clamps;
audio or video editing software.
Suggested materials and tools for optional finishing:
the rest of a discarded CD-ROM;
a drill bit with a diameter equal or slightly bigger than the microphone from the sound recorder;
5 steel rings 10mm outside diameter;
some coloured (low temp, small diameter) melt glue (no glue gun required for this part);
a cutter knife;
some anti stick baking paper;
other Star Trek sounds and spoken text on file.
About 25 cm of aluminium wire 1.5 to 3 mm diameter, if possible flattened to a square section.
The picture below just shows the main parts.