Description The Electric Fence Beeper is a device to safely check if there is power on a fence line. Simply hold the beeper near the line and if there is an electric current present the tester will beep. Easy and convenient fence testing right on your key ring!PRODUCT DETAILS:Easily check your fence with the key ring beeper Works on any electric fence energizer brand Hold the Keyring Fence Tester close to the fence wire. If the Fence wire is live the tester will signal with a beep Replaceable Battery Included