The DA-610TO Sensor which comes standard with all Wireless Drive-Alert Systems should be placed as close to the drive as possible. Many customers place the sensor under bushes, flowers, or other landscaping along the driveway. Others attach it to a post along the drive. However, many wish to keep the sensor out of sight and do not have landscaping next to the drive in the area where they wish to place the sensor. For those applications we recommend placing the sensor under one of our discreet DA-ROCK1 faux-rocks. The sensor will be hidden from sight, and will still detect vehicles and send the signal to the house without any impact on performance.