A mobile phone includes a power source, a power managing unit, a central controlling unit, a switching unit, and a personal defense unit. The correlator unit may have reference signals pre-compensated with intra-codeword interference. In one implementation, the touch-screen user interface enables a user to turn one or more pages in response to applying a force or pressure to the touch-screen display. The orthogonal mirror is arranged such that the polarization direction of the laser oscillated light is parallel to the valley line of the orthogonal mirror.