The E-Collar Technologies Einstein ET-800TS is a high-quality remote trainer designed specifically for big dogs. With a range of 1760 yards, this trainer allows you to have complete control over your dog's behavior. The 1-100 stimulation scale provides a wide range of options for training, and the blunt stimulation ensures superior results. The lock and set feature allows you to lock in a desired stimulation level, reducing the chances of overstimulation. The transmitter is equipped with an LCD display, adjustable dial, and four control buttons for easy operation. Additionally, the night tracking light provides added visibility in low-light conditions. The ET-800TS uses rechargeable batteries for convenience and sustainability.