... Contact ID protocol(alarm information, status information, AC power off and recover, Low voltage, test)8. Support wireless “ding-dong” ... doorbell function 9. Alarm priority, Reset, activate and disable alarm call and alarm SMS Technical Parameters:l Working power: AC=100 ... of the world KT-G8A Dual-network wired&wireless alarm system ,pstn and gsm alarm system KT-G8A Dual-network wired&wireless alarm ...