The ParkSonar-EZ-72 has a detection zone of ~6 feet. The ParkSonar-EZ-72 will allow for 14+ simultaneous sensors depending on sensor mounting and environment.

Product Specifications
 ● Resolution of 1 inch
 ● ~10 second target acquire time
 ● ~5 second target release time
 ● Automatic multi-sensor operation
 ● Vehicle Detection Sensor
 ● Maximum reported range of 254 inches (645 cm)
 ● Choice of 2 digital outputs: Logic Level (High/Low) and RS232 serial
 ● 42kHz Ultrasonic sensor measures distance to objects
 ● RoHS Compliant
 ● Virtually no sensor dead zone, objects closer than 6 inches typically range as 6 inches
 ● Operates between 2.5 and 5.5V
 ● Low 2.0mA average current requirement
 ● Small, light weight module
 ● Designed for easy integration into your project or product
 ● Proximity Detection zone of 6 feet (72 inches)