I.Product Description KD661/KD661 C is reliable and safe for pet training. It completely got rid of the trouble of wiring, and very convenient to establish a safe area of pet activities. Transmitter as the center, the remote control radius is up to 500 meters, and coverage is up to 78 hectares. In this large space, … Continue reading KD-661/KD-661C Wireless Electronic Pet Fence System User Manual