In accordance with the present invention, the circuit apparatus has a first and a second connection point each for respectively connecting to the first bay and second bay for communicating with them to determine which device in the bays is the master device. The high molecular weight amorphous polyester resin in the shell may prevent any crystalline polyester resin in the core from migrating to the toner surface. The apparatus has a screen which may be electrically connected to a heating device. The water dancing speaker of the present disclosure can produce liquid columns that vary rhythmically with the audio characteristics of the played tracks, which improves the ornamental effect of the speaker.