The WP5C is a complete battery operated vehicle detection package for single entrance . The 9-volt processor and transmtter are conformal coated and housed in a Nema 3 enclosure. The included Probe has a 25 foot lead. This system has a transmission range of 2,000 feet. Our system is now supplied with a wireless sounding system for inside the building. Transmission Range: 500 feet. The convenient plug-in chime receiver has four volume levels and 52 melodies. Up to 8 chime receivers can be used. Non-volatile memory means you can simply move the receivers from one room to another.