Microphones and Amplifiers.
Listen Through Wall Device
This highly sensitive wall contact amplifier and microphone can listen to conversations through up to 30cm of solid concrete, walls, windows and concrete/steel floors such as found in many flats.
Miniature microphone measuring only 6mm in diameter. Suitable for inserting in small openings or for concealing on yourself. Can be connected to a suitable recorder or to a amplifier.
This watch has a small implanted microphone inside the strap of the watch, put the watch on your wrist and just run the thin wire inside your shirt sleeve and plug into a recorder concealed in your pocket/clothing.
Plug in the headphones to the high gain amplifier and zoom into those distant sounds, this small hand held unit is discrete to use yet gives superb results.
A high quality pen concealing a hidden microphone can be connected to a body worn recorder.