Special Pie Hivista Interactive Whiteboard Induction Receiver Precise Multi-Touch Smart Board For Most Projector Upgrade Accessories(F-35L) Small

High precision and usability,No delay Multi-users writing (Max 64 persons can write simultaneously) Works on almost any surface and transforms them into an interactive whiteboard Small volume, extremely easy to carry and install The active area can be adjusted to adapt to any projector(from long focus to ultra-short focus)