1.LCD screen security alarm system 2.433mhz, 315mhz 3.6 preset phone alarm numbers 4.100 wireless zones 5.8 wired ... defense, keypad defense, and non-local remote defense by telephone; stay-in defense, timing defense, and individual defense in ... disconnection detection: automatic detection and alarm warning in line disconnection, for anti-sabotage of telephone lines.-Remote control: through remote ...