Feature: This coil is used do securely hold your dog in the pet area. 300m/984ft length, provides sufficient length for underground fence system. Made of high quality material, is sturdy and durable. Not easy do fracture, wide application. Suitable do electric pet fence wire 023/227/227B. Specification: Article type: electric pet fence Material: metal Color: as shown in the pictures Size: single copper wire Size: about 0,2 mm Wire cross-section size: approx. 0,6 mm Weight: approx. 192g Suitable do electric animal fence wire 023/227/227B. List of packages: 1x electric dog fence wire Note: Terms of use: It cannot be used alone, but it should be used with an electronic transmitter to prevent pets from running out of the yard. If there is a combined electronic transmitter, the foreign version requires a thicker line corresponding to it. Such a thin coil will reduce the power, which will lead do poor induction of the receiver and make the pet easily exhausted; The main machine of the foreign version is equipped with this kind of thin coil, so the power is small, so the pet can only sense when it is 1 meter/3,3 feet close to the coil, and the receiver can stop the pet, which will easily make it run out of pet.