This client's son has limited independent movement and needs to ask for help for almost everything he does so they are looking for a way to give him more independence and control. He loves to watch TV but currently can only turn on/off the TV himself with the help of an Alexa device. The voice recognition is not good enough to understand other commands and has a menu that is too complicated for efficient use.

Your task is to design a device which can change the channel and adjust the volume on a Roku TV. It must be mounted on the wheelchair, accessible to reach but not be in the way of normal operation of the chair. It must be extremely simple to use and understand, for example it should not require more then 1-2 'clicks' to reach the goal. It should be robust and easy to clean.