Combine photoelectric smoke, 135 F heat, carbon monoxide, and low-temperature reporting in one 345 MHz detector with an 85 dBA local sounder and bilingual voice alerts.
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.
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.