Work by the current sensation of human body, the glass surface is laminated with a special transparent conductive metal material layer. When a conductor touches, it will change the capacitance of the contacts, which can detect the location of touch. But does not respond to touch with gloved hand or hand-held non-conductive objects, which is an increase of more insulation media. The capacitive touch screen sensor minor and quick touch, scratch, not afraid of dust, water and dirt effects, suitable for use in harsh environments. However, the capacitance with temperature, humidity, or the environment of different electric field changes, it is less stable, low-resolution, easy to drift.