... 4 G frequency technic 2.online realime communicate 3.4 AA battery more than 1year phone remote control lockProduct details: The ... power networking is equipped with wireless access. . Powered with4 AA batteries, it can last for 1-3 years. It ... secondsWarning toneMuti-type music warning toneGuiding lightsTo function,Low battery alarmLow battery alarmDoor lock guiding lights, voice alarm, center hoster ...