Pinhole Style Microphone,Omni Directional, Monitor Range 10-35sq.m,suit for prison,jail room,any small room,very secretly

Part of customers: Guizhou Provice prison; Dalian city jail rooms etc

Parameter:

Monitoring Range                        10~35sq.mtransmiting distance(shield cable)  3kmFrequency Response                    20Hz ~ 20kHzSensitivity                                    -47dBSNR                                            50dB(1m/40dB)  

                                                   30dB(10m/40dB)1KHz at 1 PaPolar Pattern                                Omni-directional   Dynamic Range                            80dB(1KHz at Max dB SPL)Maximum Level Input                    120dB SPL (1KHz,THD 1%)Impedance                                   600ohm (imbalance)Signal Output Extent                     2.5Vpp/-25dBMicrophone                                  Electret condenserSpecial Circuit                              digital de-noise

Protect Circuit                              Over-loading protection, Lightning proofAudio Preamp                               Build-inOutput Connector                          Power+, Audio and GND    

Cable                                           3 x 0.5mm2 RVVP cableVoltage                                        DC 12V (8 ~ 20V)        Current                                        17 mATemperature                                 -25°C ~ 70°CColor                                            WhiteShell's Material                             PVCSize                                             60mm × 22mm

Weight                                         30gStandard                                      CE FCC

Detail Introduction:

*Professional wired audio surveillance & monitoring microphone.*Low noise, Low echo, clear speech, low price.*Built in digital audio disposal circuit , two step dynamic de-noise disposal.*Special closed circle circuit design, eliminating electronic noise.*High sensitivity, low noise.*Restraining high intensity voice automatically, protecting rear devices

*Echo-concelling appearance design, eliminating echo in big hall.*0.8mm pinhole design, clear picking voice.*Pinhole style, little volume, suitable for jail room and other small room.

*Long-distance transmission, the maximum transmiting distance can reach 3km. 

*Cable is required: 3 x 0.5mm2 RVVP cable, 4 core phone line, network twist line, etc.*Built-in over-loading protection and lightning proof circuit.*Pre-amplifier, directly drive DVR, VCR, headphone, loudspeaker etc.*Excellent voice experience, widely working temperature: -25~75°C*According with FCC,CE standard.

I.TRADIO pinhole,hidden,mini,built-in wall Audio Surveillance Microphone