Don't be caught unaware by unexpected visitors. The Dakota Alert Wireless Rubber Hose Driveway Sensor Transmitter will send an instant alert from the foot of your driveway when a car enters your property. It won't be triggered by deer, large animals and other wildlife that would cause false signals with a motion detecting system. The Wireless Rubber Hose Driveway Sensor Transmitter includes a weatherproof probe that can be laid across the base of your driveway and sends a signal to the transmitter when a car is detected (drives over it). The weatherproof transmitter is connected to the hose. It operates on one 9-volt battery, sold separately, and is easily mounted on a tree or post near the driveway. The transmitter sends a radio frequency (RF) signal back to a Dakota Alert Wireless RF Receiver, sold separately, which can be placed in your home up to 600 feet away. The receiver will then put out an audible tone to alert you when the transmitter has been triggered. As an alternative, a Dakota Alert Portable Wireless Receiver is available that you can carry with you (or on your belt using the included holster) anywhere on your property. One receiver is required for an alert notification. The rubber hose driveway sensor requires the use of a 9-Volt Battery, sold separately.