The Directed Installation Essentials Stinger Double Guard Shock Sensor is the most effective protection against shock/impact. It uses patented electromagnetic technology to eliminate mechanical parts. Two outputs are provided. The first offers a Warn Away response on light impact and the second instantly triggers the alarm on hard impact. This unit draws less than 1 mA and includes the plug-in harness for all alarms with the standard 4-pin sensor input plug. The plug may be cut off harness for non plug-in applications.