This vehicle sensor works in conjunction with Vehicle Sensor Probes that are available in 100', 200', 350', 500' and 1000' lengths. Simply bury the probe next to your driveway. The console will then buzz whenever a car approaches! Up to 2 probes may be attached to each console. For full featured integration, the console also has 2 SPDT relay outputs which allow you to connect to a security and/or automation system. Cable lengths can be added to for a custom length of up to 2500'. Cable is sold in 200' spools. A splice kit is required for each extension added to maintain a weatherproof seal. To activate X10 lights or appliances, simply purchase the optional Powerflash Interface (#4060). Compatible with home control interfaces with digital low-voltage inputs.