If you doubt the loyalty of your friend, the sincerity of the words of the boss. Then you can put a listening device on him and thereby quickly solve all your problems. You won't be able to make a listening device very quickly, but the main thing is the result.
It is necessary
Old battery block, 2 tinned wire pins (1mm diameter), tweezers, old printed circuit board, scissors, tool kit, epoxy compound, radio microphone
Instructions
Step 1
Solder 2 pins on the back of the old battery pad.
Step 2
Use the hinged method to unsolder the parts above these pins.
Step 3
When parts come out, bend the rings and slide them over the pins.
Step 4
After you finish adjusting, cut the pins to the length you need and solder the top plate from the old PCB.
Step 5
Solder the required antenna connector on the plate.
Step 6
Fill the resulting device with epoxy compound.
Step 7
For the old battery, use the same metal casing in which to place the radio microphone.
Step 8
Make a small hole opposite the microphone and you can assume that the bug is ready.
