Units allows you the option of seeing your dog's distance in yards or meters. To change the distance read out, Highlight the word "units" and press the right arrow key. Highlight the word Distance: Yards and press the arrow key to the right to change it to meters. Press the arrow key to the right again to change it back to YARDS. You can also change the TIME read out on the UNITS screen. Use your down arrow to highlight the word TIME: 12H and press the right arrow to change it to 24 hour or Military time. Press the arrow key to the right again to change it back to standard 12 hour time.