SG30 LED Style Stop And Go Lights consist of an SG20 (control unit) and an SG10 (drone unit) linked via a communication cable with internal flashing circuitry. Flipping the switch on the control unit will cause either the red or green lamp to flash on the control unit and the opposite to flash on the drone unit. The user is responsible for providing a power supply to the control unit and attaching the communication cable to the drone unit.
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