An alternative to the interactive whiteboard is the interactive Projector, which is manufactured by Indesign in the end of 2009, and which can turn suitable surfaces into a virtual whiteboard. Interactive projectors work by detecting the position of an active IR light pen when it contacts the surface where the projected image is displayed. This solution allows the user to experience some of the benefits of a physical IWB. 

Product specification:

Projector
Native resolution                                                      1024×768
Display technology                                                   DLP 0.55"
Brightness                                                                 2700 Ansi lumens
Contrast Ration                                                        2600:1
Lamp                                                                           230W SHP
Lamp life                                                                    5000Hrs
Projection Method                                                    Ceiling, Front, Rear
Power Consumption                                               250W
OSD Languages                                                      Multi languages(English, German, Spanish, Portugese) 
Portable whiteboard
Movement Detection Technology                          Infrared
Active Area (max projection size)                          150 inch diagonal
Active Area (horizontal angle)                                 33 +/- 2 degrees
Active Area (vertical angle)                                      0-30 degrees
Calibration Technology                                           Infrared Positioning
Active Distance (from projection screen)            3.2 - 5 m
Connectivity Interface                                              1 x USB Cable (connection distance up to 16 m)
Power Requirement                                                4.5 ¨C 9 W (from USB port)
Power Consumption                                               < 1.5 W
Projection Size                      Distance between Receiver and Projection Surface
56 inch                                                                      1.6 m
68 inch                                                                      2.1 m
70 inch                                                                      2.3 m
75 inch                                                                      2.5 m
85 inch                                                                      2.8 m
92 inch                                                                      3.2 m