With the ViewSonic PJ-IWBADP-004 Adapter Plate, you can easily install select ViewSonic projectors on the existing mounts (V2, V3, V4) of Promethean projectors (PRM 10, 20, 30, 25, 35, 45). This allows you to easily upgrade and replace outdated Promethean projectors and still utilize your existing interactive whiteboard.