Perfect for storing my iPad Pro 11β. I use it on my treadmill to watch videos and even in Zoom meetings during workouts. It's nice to have the height adjustment, which came in handy when I was shooting videos while sitting in a low position a few feet away from me. I adjusted it and in my chair it stretched from the footrests to a comfortable distance from my face (a heavy book helped keep it from tipping over). As for the treadmill, I put it on a transport box to give it more height and put a thick book on it to keep it from rocking (I don't think it would if I used a wooden box). I use a bluetooth keyboard on a treadmill.