The remotely controlled electronic water timer adopts a toy-like modified airbag and uses 18kHz sound wave as the remote control signal. Therefore, this sound wave is called infrasonic wave. Using this sound wave as the remote control command will not affect or interfere with others' lives. This transmitter is passive, which can remotely control the electromagnetic coil to control the pilot valve by squeezing the airbag with hands. It has the advantages of simple production, convenient debugging, low cost, reliable performance, and no interference with other electric appliances.