Tips: mark it, record it, photograph it, arm it, secure it, store it, insure it, and report it.
This firm sells a pepper spray disguised as a walking weight, a stun gun disguised as a cell phone, as well as more serious defensive weapons. The company also sells intruder detection, deterrence, and alarm devices.
Unmoderated forum on marine electrical and electronic equipment. Good advice and resources here, but you have to dig and you have to be selective.
System connects to a wide variety of sensors from simple magnetic reed switches to sophisticated passive infra-red (PIR) detectors. Uses digital access keypad. Will sound alarm and flash your spreader and running lights.
All purpose monitoring alarm for engine, electrical, batteries, fire, flood & bilge, gas & toxic fumes, GPS, weather, sounder, plumbing, intrusion, and more.