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4. Voice activated monitoring
5. Built in adjustable sensitivity voice activated microphone.
6. Built in High sensitivity monitoring amplifier microphone
7. Built in phone number filter function, other phone will not allowed to monitoring.
8. Can used SMS to set active or deactivate sound active mode.
9. Built in shock alert function, will call and send SMS when shock is detected.
10. Easy to operate, just install SIM card and use SMS for all function modes