... ways: SMS, Main Host (Keypad), Wireless Keypad (optional), Keychain Remotes, and phone calls. (PSTN alarm do not support SMS) 9) Available ... power. 11) Disconnection alarm, auto priority to occupy the telephone and monitoring function to hear what is happening. 12) Door\window ... /window sensor, gas alarm, smoke alarm, outdoor big siren with sound and flash, 868/433mhz doorbell button, extra keypad etc.