The TXRX2000A is Rodanns 500' range outdoor passive battery operated alert systems. Set this driveway sensor alert system up to provides advance notice as someone enters the driveway. Easy to install With frequency-tuned antennas for 500 foot range. The RX2000A wireless receiver alarm plugs inside the home and gives many chime options to choose from. It has a resettable 5 digit LCD counter. This driveway alarm installs very easy and gives a door bell wireless chime system that sounds a quiet notification. Features: Detector powered by 9 Volt Lithium Battery. Outdoor Wireless transmitter up to 500 ft. Long battery life circuit design. LCD reset able counter built into receiver. Fully automatic no alignment required.. Receiver powered by economical 12V DC UL Approved plug-in power supply no batteries to change. Uncomplicated wiring install accessories in minutes.. Universal mounting bracket allows for easy ceiling wall or side mounting.. Welcomes with a pleasant sounding chime.. Helps control theft.. Fully automatic and maintenance free no reflectors or controls to align.. One year warranty against defects in material or workmanship.. Prevents unannounced entry. FCC Approved