I wanted this product to go across my bed so I could use my laptop while in bed. The arm was not long enough to reach across my bed in fact it would not reach across a child's bed. The arm was too short for the tray to reach. The design needs a lot more work. I was disappointed as I have been looking for a product like this for a long time only to find I still haven't found it. My husband was able to make the arm a bit longer but it has nothing to support it, so is not as effective.