BlueSolar PWM Charge Controller (DUO) LCD & USB Charge Control - 12/24VDC - 20AFeatures: Liquid Crystal Display Two 5 Volt USB outputs Lighting control function, fully programmable Three-stage battery charging (bulk, absorption, float), fully programmable Load output with low voltage and manual disconnect (programmable) Load output protected against overload and short circuit Protected against reverse polarity connection of the solar panels and/or battery Charges two separate batteries Programmable charge current ratio External Temperature sensor Please contact your dealer for any returns, repairs or support issues related to this product. Quick Guide (pdf)Brochure (pdf)