A method in a working machine, comprising a frame movable by means of a wheelwork, the frame provided with a boom assembly movable around a first pivot point in a first angle sector. The modem examines the power spectrum of fast retrain signals both when the telephone is on-hook and off-hook. The method further includes the step of adjusting one of the transmission power or the transmission speed based on whether the transmission error rate of the signal transmitted at the reduced transmission power is still at its respective acceptable operating level. Since the light conversion member is disposed on the side surface of the circuit substrate, the light conversion member may be aligned with the light source without interfering with the circuit substrate. A contact plug penetrates the first insulating layer, the conductive layer, and the second insulating layer. The doll may interact with the interactive application through the speaker module and the sensing module.