I've worked with clifford, alpine and Dei products (viper, sidewinder) and find the DEI shock sensor, when tied to the cars main harness as recommended to be the least likely to false and be the most consistent. If you can find a place to buy the DEI uninstalled, the pricing is very reasonable for the quality received. If relatively unfamiliar with auto wiring then pay to have the thing installed. Alarms are only as good as they are installed!