Vehicle Detector, Includes Relay, Number of Channels 1, Operating Voltage 10 to 30V AC, Minimum Loop Inductance 20 uH, Maximum Loop Inductance 2,000 uH, Features Automatically Compensates for Loop and Lead-in Sizes, Designed to be Cross Talk Free Between Other Loops, Fail Safe Operation, Plug and Play, Overall Height 1 1/2 in, Overall Length 1 1/2 in, Overall Width 3 in, Minimum Operating Temperature -35 Degrees F, Maximum Operating Temperature 165 Degrees F