This In-Ground Fence System is one of the most affordable ways to keep your dog safe and secure in his own backyard. From the Receiver Collar, he’ll hear a warning tone as he nears the boundary you established followed by a quick electrical stimulation if he attempts to cross it. The lightweight, adjustable collar is the perfect complement to the new-found freedom your dog will experience on his own turf. System Includes: Transmitter with Power Adaptor Deluxe UltraLight Receiver with adjustable collar for neck sizes from 15 cm to 66 cm Operating and Training Guide 150 m of Wire and 50 Flags Test Light Tool Battery