The DCRH-4000 is a very reliable and easy to install driveway alarm. The transmitter operates on one 9-volt battery and has 25' of 3/8" diameter exterior hose that will lie across the drive. When a vehicle drives over the hose, a signal will be sent to the DCR-4000 receiver up to 1 mile away*.
The transmitter is weatherproof and meant for exterior locations. Up to 12 zones can be monitored with additional transmitters. The transmitters can be programmed so they will each sound a different tone at the receiver.
The RE-4k Plus receiver plugs into a standard wall outlet and can be placed on a table or mounted on the wall. When the receiver gets a signal from the transmitter, one of twelve different tones will sound for a few seconds. There is also a volume control, allowing you to set the sound to the desired level.