1, PSTN & GSM security alarm with LCD display and keyboard 2,99 wireless and 2 wired 3,Voice ... , on-site intercom functions; support built-in two-way intercom function without external speakers, alarm or remote on-site staff yelling, duplex intercom ... / O port control interface. (Can be extended to 9 Way Cable alarm zone) 22, 99 channel wireless zone can enter 99 different ...