We got a D cell
battery operated alarm with wireless motion detector
Cost about $50?
We stick it up near the door way with velcro. 120Db and a flashing light. Buggered if I know who it would scare most, us or the crooks!
Has a
remote switch to turn it on/off.
Arlec - Products
Code :
Product Name :
Product Feature :
DA200
WIRELESS ALARM SYSTEM
The DA200 is a DIY wireless remote controlled security system. The kit contains: external control panel, siren, movement activated sensor, portable On/Off alarm remote control unit. Sensor detects motion within an 8m radius and has a scan angle of 1200. 12 month guarantee. Additional components/accessories available.
For the tropics we got a new
cockpit companionway door - below. We use it when ever we are out

blissfully cool
boat on our return. We could lock ourselves in at night too.