Vehicle Detector, Number of Channels 1, Operating Voltage 10 to 30V AC/DC, Minimum Loop Inductance 20 uH, Maximum Loop Inductance 2,000 uH, Features Fail Safe Operation, Separate Power/Fail and Detect LEDs, Resistance Properties Impact , Overall Height 2 1/2 in, Overall Length 2 1/2 in, Overall Width 1 in, Minimum Operating Temperature -35 Degrees F, Maximum Operating Temperature 165 Degrees F