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 Self-Compensates for Loop and Lead-in Sizes, Designed for Solar Powered Applications, Designed to be Cross Talk Free Between Other Loops, Fail Safe Operation, Plug and Play, Small Profile, Switchless, Self Adapting to Most Common Installations, Resistance Properties Impact , Overall Height 1 1/2 in, Overall Length 1 1/2 in