OPT-LD4-111 is an LED driver that can adjust the level of LED lighting with constant voltage through 4 output channels with external DC supply. The supply voltage is determined between 12-24 VDC, according to the needs of the load. LED lighting operating with the same voltage should be inserted in each channel. The maximum current that can be drawn per channel is 3 Amps. The total current can be increased to 6A or 12A by combining channels both programmatically and physically. The device can also be used for LED drivers functioning with PWM signals.