... (center monitoring station),can user our GSM CID connector to have this function. 15.disconnection alarm,auto priority to occupy the telephone ... , DC=12V 1AA .Static Current:Less than 50mAB.Alarm current:Less than 500mA GSM transmit power2W Standbyaround 16 hoursFull charging time:12 ... . …Wireless Siren ~1 pc. …Power Adaptor ~1 pc. Home Security GSM Alarm System wireless With LCD Touch Keypad CE,FCC