Vehicle Sensor kit. Ultra Low Power Solar Friendly Plug & Play “Micro” Vehicle Probe. designed to handle all parking, drive-through and access control applications. This device will work when connected to an embedded street loop or, (with a switch setting) the device will operate with a Mini-Loop available from Diablo Controls. The Diablo Controls Mini-Loop is a small pipe shaped device approximately 5î by 3/4” and is designed to be buried in the ground to detect vehicles. Power – 10 to 30 Volts D.C. ( 30 Ma. Max at 12 Volts).