The listing, ELECTRONIC LISTENING DEVICE has ended.
Super small listening device that transmits through fm band.
specs: excellent, crystal clear sound quality.
very high microphone sensibility.
built-in audio amplification.
long battery life.
professionally built and tested (smd technology).
electrical characteristics:
operating frequency band: 75-108 mhz.
battery used: standard 9v.
current consumption: 7ma
battery life: 5 days
range: 500 meters in the open.
i bought this off of ebay and it works fantastic. you can hear a whisper.
also comes with instructions