Silent zones are provided to prevent unwanted alarms 

Collision Avoidance Modules (CAMs) are included inside modules HN-MFG-CA and HN-MFG-CD so that a truck will be alarmed if another truck enters its safety zone. 

The Field Generator mounts on the overhead guard of the vehicle. The Field Generator creates a pulsing magnetic field 360 degrees around the vehicle. 

This PAD is made to be worn in a shirt pocket, on a safety vest, or clipped to clothing. The 1-Piece PAD module is functionally the same as a two piece module. This unit should be worn at chest level or higher, in a shirt pocket, attached to a safety vest 

Silent Zones are used to create areas where the warnings emitted by the Personal and Vehicle Alarm Devices are ignored. 

The VWM can be installed at any convenient location where its LED is visible to the operator and the sounder can be heard.