... easier. It can call 6 users’ numbers by GSM dual-network when it alarming. Listening-in function is available for users ... . Does can work in my country? ------- yes,it can be compatible to three GSM frequence ,900/1800/1900 MHz,so it ... .2VSiren Volume: 110dBStandard pack components1 main panel, 1 wireless infrared (motion) detector, 1 wireless door magnetic detector,1 siren, 2 remote controllers ...