1. WIDE USE. Match all types of energizers. Can be used on any type of electric fence including steel, poly wire tape etc. 2. . Do not need to touch fence wire. Just BUTTON and hold it close to fence, it give a loud beep if the fence is active. Working distance about 20cm near fence. 3. UPDATE BEEPER. Add on-off button and light. Flash be useful when in dark places or in the evening. 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. Material: plastic colour: black Package Contents: 1 x Electric Fence Beeper Only the above package content, other products are not included. Note: Light 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.