(Parker Mccrory) The most technically advanced Parmak Fencer. Has a digital meter that shows the voltage on the fence within 100 volts. A “shut down” alarm sounds when the fencer is not working properly. Has an advanced, built-in computer controlled circuit. Low impedance, charges up to 100 miles of fence. For indoor installation. 2-year warranty. UL listed. (12.5 joule output).