Resistive Membrane (redundant technology): Resistive touchscreens are composed of two flexible sheets coated with a resistive material and separated by a micro-thin air gap. When contact is made to the surface of the touchscreen, the two sheets are pressed together, registering the precise location of the touch


Active Electromagnetic Board — These interactive whiteboards feature an array of wires embedded behind the board surface interacts with a coil in the stylus tip to determine the (X,Y) coordinate of the stylus. Styli are either active (require a battery or wire back to the whiteboard) or passive (alter electrical signals produced by the board, but contain no batteries or other power source)

Capacitive: Works on the voltage changes along the board as soon as any touch is felt.


Passive Electromagnetic Board - In contrast to an active electromagnetic board this one does not contain the sensing technology in the board itself, but in the pen. Tiny magnetic fibers are embedded in the whiteboard and form a pattern that an electromagnetic coil in the pen is able to sense


Capacitive Board — Just like the electromagnetic type, the capacitive type works with an array of wires behind the board. In this case however the wires interact with fingers touching the screen. The interaction between the different wires (laminated in a patented X- and Y-axis manner) and the tip of the finger is measured and calculated to a (x, y) coordinate


IR & Ultrasound: Works on the sound based technology wherein IR sensor detects whether the click has happened or not and the microphones detects where the click has happened.


IR Board: Infrared technology uses movement of the user's finger, Stylus, or other pointer on the whiteboard which is captured by its interference with infrared light at the surface of the whiteboard. When the object finger or dummy stylus is pressed against the surface, software triangulates the location of the object.


Interactive Projector: The Infrared approach to interactivity works with sensors that are external to the projection lens. In these systems, a special camera inside the projector detects the presence of infrared light which is invisible to the naked eye. The camera works in conjunction with a special pen.