Why the Leak Spy? When combined with the Leak Spy acoustic leak sensor, Neptune’s R900® radio frequency technology can transmit leak sound vibration information from water distribution mains and service connections, including alarms to signal leak conditions anywhere along the entire distribution system. Now both meter reading and leak detection can occur in parallel. Utilities can save on manpower while detecting leaks on a more timely basis, thereby reducing Non-Revenue Water. Under the ARB® Utility Management System™ architecture, an acoustic leak condition can be identified daily.