... dialing. support work by backup battery when power off GSM alarm kit EB-832( 7wired and 28 wireless zones) 1.1 ... dialing nor sms3. Supports up to 7 wired and 28 wireless zones.4. Indicates up to 30 Activated Zone numbers ... pcWireless door sensor: 1 pcRemote controller: 2pcsExternal Siren: 1pcOptional: backup battery, wireless smoke detector, gas detector, infrared curtain sensor, panic button, ...