A headphone includes a pair of right and left headphone units, a resilient band formed substantially into a U shape to be mounted on a human head, and a pair of arm members. Each of the upper and lower clip plates has a pair of obliquely and symmetrically extended branches on front side made in registry with each other and each of the branches has a magnet in distal portion. The document processing device is controlled via a controller using software instructions. The touch detection method comprises steps of: enabling the first gate line; and detecting whether the sensor pad is touched before enabling the second gate line. The dispenser includes at least one dispensing unit to supply a dispensing material on a substrate, at least one support member to support and align the dispensing unit, and a plurality of syringes mounted on each dispensing unit.