... . 1) GSM,Land-line network auto switch2) Can work with wired/wireless keypad, USB connection with PC, system setting through PC ... 3) Compact design, blue backlight, night vision, 15 wireless & 4 wired zones LCD display 4) Voice instruction on main panel and ... ) Built-in horn speaker to scare theft, 2 way talking/intercom. 6) Door bell learning funcion, several door ring choice.Door ...