1. WIDE USE. Match all types of energizers. Can be used on any type of electric fence including steel, wire tape etc.2. . Do not need to touch fence wire. Just hold it to fence, it will give a loud beep if the fence is active. Working distance about 20cm near fence.3. MORE CONVENIENT. Pocketable design. Requires 3 Volt CR2032 button Battery Operation (Not Included)4. LONG LASTING. Simple design could avoid falling damage. Made from solid materials with a replaceable battery and keyring attachment.Operation Instruction:1. Test Fence line, , Ground System, Hook Up Wire and Fence Components 2. Make your fence is wired properly3. Requires 3 Volt 2032 button Battery Operation (Not Included)4. Attaching the to wire5. The alarm indicates whether it has voltage6. If no alarm, the cause may of the following: A. The wire has no voltageB. The has electrical problemsC. The battery has no electric.Colour:blackMaterial:plasticPackage Contents:1 x Electric Fence Voltage Tester