MOBILELOCK is equipped with a piezo vibration sensor. Moving the device around will not set it off. It is programmed to pick up sound vibration and performs best when magnetically attached or screwed to metal. Perfect for connex boxes, trailers, AC units, heavy equipment, and appliances. 7 levels of sensitivity can be chosen from depending on the application and filters can be applied that only allow alarms to be sent if multiple hits of vibration are detected within a certain time.