GSM bug

specification: GSM tri band module:  900/1800/1900
Voice sensitive:  -75db 
Standby power consumption:  5mAh
Working power consumption: 200mAh
Power:  3.7V 550mA
Charger power:  5VDC at 500mA
Dimension:  52x39x17mm
Weight:  40g
Filter mode:  4 sensitivity voice filter
Alert mode: 3 SMS number&1 calling number
Control mode:  SMS control
Inside box:  GSM-WM38 main unit, 5V charger

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 device.
Built in rechargeable polymer LIION battery, with capaty 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