Complete your driveway alarm kit with this wireless transmitter! This driveway sensor is perfect as a replacement for a broken transmitter, or as an addition to driveway alert systems that need to monitor an additional driveway. With a transmission distance of approximately 2500', this is the best driveway alarm system for any residential property or residential area. This transmitter is compatible with all of Milton's new driveway signal systems and not compatible with the older 2500 series chimes. You can monitor as many driveways as you like with a single driveway chime alarm and multiple transmitters. The transmitter has a small tube on the bottom that connects to a driveway signal hose.