Two-stage impact(shock) sensors Impact sensors, also known as shock or vibration sensors, are designed to detect impacts to the vehicle. There are 2 levels of detection (depending on alarm functions). The first stage just chirps the siren if the sensor detects light impacts to warn away any other possible attack. Heavier impacts cause the alarm to sound fully. All models are adjustable for sensitivity. Also suitable for connection to factory fitted alarm systems (extra components may be required) Suitable for any alarm with a negative trigger. MES80 - Suitable for MAP70, M80, MAP80 and M80II series