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OTP-GSM87 Phone filter Voice shock active GSM module

GSM Listening device



  • Voice active monitoring with super mini dimension.
  • Built in adjustable sensitivity voice active microphone.
  • Built in High sensitivity monitoring amplifier microphone
  • Built in phone number filter function, other phone will not allowed to monitoring.
  • Can used SMS to set active or deactivate sound active mode.
  • Built in shock alert active function, will call and send SMS when detect shock alert.
  • Easy to operate, just install SIM card and SMS setting for all function modes
  • Built in earphone jack, allowed to communicate as spy device.
  • Built in rechargeable polymer LIION battery, with capacity up to 550mA
  • New less power chip, with standby mode up to 72 hours and 2 hours monitoring mode.
  • Built in charger circuit allowed using in charge mode.






Accessories :

Power Charger and GSM monitor


Optional accessoreis:  Neck Coil and mini earphone



User's Manual Download: