Abstract: A 3C smart ring, capable of coupling 3C products in a cable or wireless communication manner, mainly includes a ring body, a power supply unit, a power switch, a control unit, a transmitting/receiving unit and a microphone. The power supply unit and the transmitting/receiving unit are both coupled electrically with the control unit. The power supply unit is to provide electricity for operating the 3C smart ring. Through the transmitting/receiving unit, the 3C smart ring can couple via wireless signals to 3C networking devices. Further, the power switch and the microphone are located at a lateral side of the ring body, in which the power switch for controlling on/off of the whole ring is coupled electrically with the control unit. The microphone coupled electrically with the control unit is to forward voice signals to the networking 3C devices via the control unit and the transmitting/receiving unit.