Add photoelectric smoke detection, 135 F heat sensing, rate-of-rise response, an 85 dB horn, and automatic drift compensation to compatible DSC 433 MHz systems.
Use one 433 MHz transmitter for a magnetic contact or garage-door tilt zone plus two normally closed external-contact zones, each with its own serial number.
Monitor an overhead garage door with a magnet-free mechanical tilt sensor, slow-loop false-signal resistance, five-year battery, and extended -22 to 120 F range.