LED constant voltage dimmer; 4 independent channels; Prog button and red LED for address allocation; Green LED flashing: normal operation; OT.LED: over temperature (≥70°C); OV.LED: over voltage (>40V DC); Working voltage: 21-30V DC; Input voltage: 12-36V DC; Rated current: 5A x 4 channels; Rated power: 4 x (60-180W).