In this movie, the keypad for the house is for a Radionics alarm system. Every alarm system has back-up batteries, to keep the alarm system somewhat working. Depending on the communication option, it ...

RADIONICS Modem II, Modem IIE, Modem IIa, BFSK formats, SK FSK1, FSK2 formats, WESTEC Format 6, Varitech. Each line equipped with non-volatile memory which stores last 256 alarms received and ...