Abstract: An input/output signal transmitting stylus includes an external case, a cylindrical body within the external case, a pickup rod partially within the cylindrical body and for outputting a signal, a transducer connected with the pickup rod for actuating a switching operation, a transducer operated by the transducer actuator, a circuit substrate for interfacing a signal input by the pickup rod, and spring within the cylindrical body and engaging the pickup rod enabling the pickup rod to reciprocate linearly within the external case and cylindrical body. The cylindrical body includes opposite front and rear walls and the pickup rod includes a disk disposed between the first and second walls so that the movement of the pickup rod is limited in two directions. Therefore, the pressure applied to the transducer is limited. The cylindrical body provides protection to the spring by preventing the intrusion of foreign matter extending the lifetime of the stylus.