A steam iron includes an iron unit and an evaporating unit. Signals from the accelerometer enter a microcontroller and used to determine a gesture type; the microcontroller then generates an encoded command appropriate to a device to be controlled and broadcasts it with an infrared transmitter. The test circuitry then generates test data corresponding to the received signals. The intermediate section may be axially expandable upon the introduction of a substance into a port that may be located in either of the first and second end members or the intermediate section. Thus, the stems, the flowers and the leaves of the plant function as a medium to transmit the sound wave from the sound so as to output a sound wave in a different sound transmitting way, thereby enhancing the sounding effect of the sound.