Microphones and Amplifiers.
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.
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.
A high quality pen concealing a hidden microphone can be connected to a body worn recorder.
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.