The smoke detector long-distance wired microphone microphone is a passive hidden wiretapping system specifically design for intercepting audio converstations in a given room or area.

The three main advantages of this system are:

1. it is extremely hard to detect because it is totally passive (it does not send out any RF signal and it has been assembled with low-resonance components);
2. it is carefully hidden inside an ordinary smoke detector (not working) for maximum concealment;
3. it is able to send room audio down to ordinary cables (not included) up to a 2mi/3km distance (i.e.: from the monitored area to the listening post a maximum 2mi/3km distance is allowed).

Besides, the special microphone capsule and embedded preamplifier make it a truly professional piece of equipment as follows:

• operating range from listening ranges from 30 to 300sqft/10 to 100 sqm
• frequency response 250-5000Hz
• 100dB/mW sensitivity
• S/N ratio 65dB, 1Khz at 1 Pa
• embedded surge protector
• impedance 600Ohms
• power supply 8-20VDC
• power consumption 25mA
• embedded noise and echo cancellation cirtuit
• embedded acoustic preamplifier for direct connection to audio recorders or speakers
• operating temperature -25+70°C
• dimensions 2"x5" -  50x103mm
• weight 2.86oz/80gr

Super compact assembly allows quick and easy installation, whereas the ultra-miniature 0.32"/8mm-wide microphone capsule hole makes this microphone perfect for extended monitoring operations.

Comes inlcuded with special power transducer to derive power feeding from 110/220VAC mains directly. Microphone color is available either in black or white (please specify when ordering), whereas the connecting wires between microphone and transducer are not included; any 4-wire shielded cable can be used up to a 2mi/3km lenght.