The present disclosure provides advantageous decorating systems for use with foodware, i. The amplifier further includes a first switching circuit for connecting one end of the first mirror capacity to the power supply terminal VDD or to the gate of a MOS transistor; and a second switching circuit for connecting one end of the second mirror capacity to the ground terminal GND or to the gate of another MOS transistor. A person at the command unit can connect a compatible device, such as a headset, to the command unit in order to listen to and speak with a person at the remote unit.