smart power windows 
Smart power windows is the description given the limiting devices needed to keep express-up windows from inadvertently severing appendages that may be hanging out of an open window. The devices automatically stop closing and reverse window direction when obstructions are detected.

A number of technologies may be used to sense an obstacle. One concept monitors the electric current or torque of the window regulator motor. Certain changes detected in the electrical current signify an obstruction, stopping or reversing the direction of the window. Another concept detects obstructions with a light curtain or an infrared detector. The light curtain stops the motor before contact is made, further reducing the potential for injury.

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