This Solar Battery Charge Controller automatically manages and regulates the voltage and going into the battery from the solar panel, and it’s designed with short-circuit protection, open-circuit protection, reverse polarity protection and over-circuit protection in order to ensure that the batteries are not overcharged. Features - Color: Black - Size: 13.3x7x3.5cm - Material: plastic. - Full function electronic protection, overload, short circuit, reverse full protection, do not burn products and electronic components - With the unique terminal, the connection is more stable, bigger and stronger - PWM main charging road, prevent over charge, over release, do everything possible to protect the user’s battery - Fashionable shell, beautiful and practical, can be used in complex and harsh environment - With USB function, you can charge the phone. Specification - Rated charging : 20A. - Rated load : 20A. - Working voltage: 12V/24V. - Floating charge voltage: 13.7V(adjustable). - End-off voltage : 10.7V (adjustable). - Discharge recovery voltage: 12.6V - USB output: 5V/3A MAX - Working temperature: -35 ~ 60°C. Package list: 1 x solar controller