Voice active monitoring, when detect voice level higher then voice setting sensitivity, the module will send SMS and making call automatically. Can set 4 sensitivity voice level of the microphone for detect voice in the area. Can be able turn off the voice detect function through SMS The microphone sensitivity can be set through SMS External sensor detect pin with hi voltage detectable Can be set ON or OFF for external detect point through SMS.

Specifications:
Network : GSM 900/1800/1900 
Power consumption : 20mA standby mode
200mA monitoring mode
Audio Surveillance : -75db
Voice active method : 1Environment voice filtering, directed human voice sensor.
Shock active method : Internal Shock active sensor
Device configuration method : Password protected SMS Text message
Active way : Voice active alert through SMS and call back
Charge voltage : 5V-6VDC 500mA
Charger input volt 100-240VAC 
Dimension : 42x33x8 mm
Weight : 15g

Package Contents:
GSM bug
Manual
USB cable
Adapter
External battery pack