Ricoh D8400 4k Interactive Whiteboard 84″- Call for best price. The D8400 offers the same touch and operational functionality as the D6500. It is an additional model to the range and will be the largest size in the portfolio. With 4K resolution the D8400 will accommodate large size conference and meeting areas but will also be ideal for signage applications.Developing and communicating concepts quickly and effectively is critical in commerce and education today. In the modern office space, collaborative working is also essential, utilising new ways of working to develop ideas easily. Ricoh’s Interactive Whiteboard D8400 facilitates efficient training and collaborative working, allowing you to develop content that will engage and enlighten user groups. And with a choice of models with and without a controller, there is a solution to exactly meet your needs.