This is new solar controller, it can fully meet your home photovoltaic system(including home lighting system )requirements. It can recognition 12V and 24V lead acid battery, lithium battery, gel battery automatically. Warm Tips: 1. Please keep it in cool and well ventilated place to maintain good heat dissipation. 2. Ensure your battery has enough voltage for the controller to recognize the battery before first installation. 3. The working temperature of this controller is -35C to 60C, please keep the controller stay in cool and well-ventilated place to maintain good heat dissipation during the summer day. Notes: 1. Please allowed 1-3mm differences due to manual measurement, thank you! 2. Due to the difference between different monitors, please understand that the picture may not reflect the actual color of the item. Specifications: Current: 40A / 50A / 60A (Optional) Material: ABS+Aluminum Alloy Color: White+Green Rated Charging Current: 10A/20A/30A/40A/50A/60A Rated Discharge Current: 10A/20A/30A/40A/50A/60A Voltage: 12V/24V automatic identification USB Output: 5V 3A Standby Current: <10mA Working Temperature: -35~+60 Item Size: 193 * 98mm / 7.59 * 3.86in Item Weight: 390g / 13.76oz Package Weight: 450g / 15.87oz Package Size: 19 * 10.2 * 4.1cm / 7.48 * 4.02 * 1.61in Package List: 1 * Solar Charge Controller 1 * User Manual (English)