Features: Condition: 100% brand new Element type: Electric pet fence Material: metal Color: as shown Weight: approx. 192 g. Suitable for pet fence 023/227/227B. Terms of use: 1. It cannot be used alone, but it must be used with an electronic transmitter to prevent pets from coming out of the yard. 2. If there is an electronic combi transmitter, the external version requires a thicker line that corresponds to the device. Such a thin coil reduces power, which leads to poor induction of the receiver and makes the animal slightly empty. The host machine of the foreign version is equipped with this thin coil, so that the power is small, so that the animal can only perceive when it is near the 1 meter / 3.3 feet and the receiver can stop the animal what the animal runs out easily. Package Content:1 x Electric Dog Fence