Build-in industrial Micro-controller.Big LCD display,all adjustable parameter.Fully 4-stage PWM charge management.Build-in short-circuit protection,open-circuit protection,reverse protection,over-load protection.Dual mosfet Reverse current protection ,low heat production.Material: ABScolour: black + greenRated working voltage: 12V / 24VRated working current: 30AUSB output voltage: 5VDC output voltage: 12VSolar panel voltage: Less than equal 50VFloat charge voltage: 13.7V / 27.4VUndervoltage protection: 10.5V / 21VUndervoltage recovery: 12.2V / 24.4VFeatures: No-load loss Less than equal 10mACircuit step-down: Less than equal 170mVTemperature compensation: -4mV / Cell / Celsius ;Working environment: working temperature -20 Celsius ~ +60 CelsiusStorage temperature: -30 Celsius ~ +70 CelsiusTemperature requirement: Less than equal 90%No condensation:Installation hole wire number: Less than equal 7 AWG (16mm2) / Greater than 3 AWG (25mm2)Package Contents:4 x Solar Charge ControllerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.