a transmitter module (31), including a first microcontroller (311), a control interface (312) associated with the first microcontroller (311), and a data interface (313) associated with the first microcontroller (311), wherein the motherboard (21) is associated with the control interface (312) to access the data of the first microcontroller (311);

a connector module (32), including a power connector (321) provided for electrical connection with the power supply (22), a transmission interface (322) associated with the data interface (313), and at least one emitter interface (323) associated with the power connector (321) and the transmission interface (322); and

at least one of the receiver modules (33), including a second microcontroller (331) associated with the emitter interface (323) of the connector module (32), an LED driver (332) associated with the second microcontroller (331), at least one RGB LED (333) associated with the LED driver (332), and a connector interface (334) associated with the second microcontroller (331), wherein the communication between the first microcontroller (311) and the second microcontroller (331) is bi-directional, the LED driver (332) controlled by the second microcontroller (331) drives the RGB LED (333) to emit light, the power supply (22) provides power to the receiver module (33) through the connector module (32), and the connector interface (334) of the receiver module (33) is associated with the emitter interface (323) of the connector module (32), so that the second microcontroller (331) is controlled by the first microcontroller (311), and the power provided from the power supply (22) is transmitted to the receiver module (33).