1. WIDE USE. Match all types of energizers. Can be used on any type of electric fence including steel, poly wire tape etc. 2. SAFER. Do not need to touch fence wire. Just hold it close 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 compact design could avoid falling damage. Made from solid materials with a replaceable battery and keyring attachment. Operation Instruction: 1. Test Fence line, Energizer, Ground System, Hook Up Wire and Fence Components 2. Make sure your fence is wired properly 3. Requires 3 Volt CR 2032 button Battery Operation (Not Included) 4. Attaching the beeper to wire 5. The alarm indicates whether it has voltage 6. If no alarm, the cause may be one of the following: A. The wire has no voltage B. The beeper has electrical problems C. The battery has no electric. Colour:black Material:plastic Package Contents: 1 x Electric Fence Voltage Tester Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.