This is the Compustar FT-SHOCK dual stage adjustable shock sensor.

The same sensor that ships with Compustar security systems, and one of the better shock sensors available. Buy it as a replacement, or as a second sensor on a large vehicle where one doesn't cover everything.

Dual stage means a light knock gives a warning chirp while a real strike sets off the full alarm, which is what stops the alarm firing every time someone walks past.

Sensitivity is set with a numbered dial from 0 to 10, 0 being off and 10 the most sensitive, so setting it up takes seconds rather than trial and error with a screwdriver.

Mounts almost anywhere, with both a strap and a bracket included so you can choose whichever suits the location.

Want tilt detection too? See the FT-SHOCK-II.