Alarm Output: 95db @ 1M. Frequency available: 433MHz/ 868.35MHz FM/ 868.6375MHz Narrow Band FM. Range: 433MHz : over 200 meters in open space. 868.35MHz FM or 868.6375 MHz Narrow Band FM: over 300 ...

[Madmanmoe64] has really done a fantastic job with this burglar alarm built into a zippo. He crammed a picaxe microcontroller, some IR LEDs, an IR sensor, a battery and various switches in there ...

[Jeff Sandberg] demonstrates that ably with his project to use ancient 1990s burglar alarm sensors in his modern smarthome setup. The sensors in question are from an old GM Interlogix security system.