An anti-theft device, for securing an electronic product during retail display, having a socket for the transmission of power andor information during normal operation, and a plug for engagement with the socket. The turbidity sensor incorporates micro focusing devices and light stop that gives no divergence excitation beam with convergence less than 1. Hence, it achieves higher simulation performance by reducing either the size of the solver matrix when the circuits are loosely connected to each other, or by reducing the number of computational repetitions due to the communication of changes of signal conditions between circuits by combining the individual circuit matrices when such circuits are closely coupled to each other. A semiconductor die, including an active surface with a plurality of die contact pads, is attached to each die attach pad and electrically connected to the leadframe by a plurality of bond wires connecting the die contact pads and the lead contact areas of the contact leads. An icon 111 of the mobile phone 11 is displayed on the input display unit 2 in a moving manner so that portions of the icon 111 appear step-by-step from the side 2-1 and finally the entirety appears.