High Tech Pet Radio Mat Pet Training System Extra Mat Extra transmitter pad to expand your Radio Mat pet deterrent kit and keep dogs and cats out of off limits areas Add as many pads as you like to control as many areas as you wish; there is no limit to the size of system you create Three modes of operation: shock only, sound only and shock plus sound Requires a standard 9-volt battery (not included) Dimensions: 12-inch wide by 60-inch long