Directional Microphone within a Cigarette Box or Mobile Phone

PKI 2930Print

This exceptionally small-sized directional microphone captures acoustic signals from up to 100 m distance, which are amplified up to max. 10.000 times by its integrated low-noise high-power amplifier. Due to the built-in high- and low-pass filters you can listen to conversations at a distance of 50 m, as they allow especially voice frequencies to pass through and eliminate undesirable noises. It is incredible, that this is possible, particularly in this inconspicuous cigarette box. Even audio transmission is done in an excellent quality. The audio signal will be transmitted wireless via inductor (inside the device) to a miniature earplug. Better camouflage is impossible. Now you can listen undetected to conversations at the table next to you in a restaurant etc..


  • Frequency: 20 Hz – 16 KHz (-3dB)
  • High-/ low-pass filter: fg= 150 Hz / 5 KHz
  • Power supply: standard 9 V battery
  • Power consumption: max. 20 mA
  • Dimensions: plastic housing in a standard cigarette box (exchangeable at any time)
  • Weight: 140 g
  • Amplifier: max. 10.000 times
  • Play-back: via wireless earplug inductor (included)