Vehicle plug-in detector that will operate on any voltage from 10 to 30 volts AC or DC. It can be connected to a standard inductive loop or one of the new mini-loops. The Diablo Controls mini-Loop is a small “pipe shaped” device approximately 5” by 3/4” and is designed to be buried in the ground to detect vehicles. The DSP-50 can be used as either a safety loop or free exit loop detector. With the flexibility to be either “fail safe” or “fail secure,” it is the most “user friendly” detector on the market today. The detector loop inductance should be between 20 and 2000 microhenries. Power- 12 to 30 volts DC. Enclosure- Impact resistant, high temperature plastic H: 2.375” (60.4 mm) W: 0.86” (22 mm) D: 2.25 ” (58mm).