With the NRS Steer Saver You can help train and refresh sluggish, dragging or soured cattle from the convenience of your horse, even when you're alone!!. Increase the longevity of your herd immensely. Transmits an adjustable stimulus to the steer. Voltage is adjustable for incremental training steps. Remote control operated. The receiver attaches to the steer’s tail with a washable Velcro wrap. One transmitter and receiver package with adjustable voltage levels.