Only one display will be working at a time, which can be switched by rotating the dial inside out. (phoneradar.com)
To set the timer, just rotate the dial and point the arrow to the desired number of hours the lid opens. (mypetneedsthat.com)
By rotating the dial, or pushing it to the left or right, you can scroll through all menus, and move selections around the screen. (anciranissansa.com)