|Functions with scratches and surface wear||Solid contaminants, moving liquids or obstructions may cause a false touch and may create dead zones until completely removed|
|Touch activated by bare finger, gloved hand, or a wide stylus||Does not scale easily (new layout required)|
|Transmission typically 90 % to 92 %||Beam spacing limits accuracy and stylus width|
|Touch occurs slightly above the actual surface resulting in possible touch parallax or an unintended touch response|
|Requires a bezel design to house the LEDs and detectors|
|Limited to 2 or 3 resolvable touches|
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