Features:

Voice active monitoring .
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
AC power supply directly, without worrying about Working time.

Specifications:

GSM band module: 900/1800/1900 MHz
Voice sensitive: -75db
Power: Battery and AC power supply
Standby power consumption： 3.7V, 20mAh
Working power consumption： 3.7V, 200mAh
Filter mode: 4 sensitivity voice filter
Alert mode: 3 SMS number&1 calling number
Control mode: SMS control