Features Compact and portable design - This charging module is shaped like a small case, fewer peripheral components and it is easy to use. Three Charging Modes - With maintenance, constant current, overload and floating charging modes, it is ideal for charging 12V lead-acid batteries. Reliable to use - The charging module also benefits from low voltage locking, end-of-battery surge protection and charging status indicating function. Simple Operation - When powered by solar panels, the internal circuit can automatically track the maximum power point of the solar panel. CUSTOMER SERVICE - We stand behind all our items with a 100% product guarantee and promise to offer you the best customer service! If you have any problem with our solar panel controller charging module, please contact us by email, we will try our best within 24 hours to reply you. Specification: Condition: 100% Brand New Overload voltage: 14.8 V. Floating charging voltage: 13.55 V. Charging current: 3A Working environment temperature: -40℃-85℃ Weight: approx. 12g/0.4oz Size: approx. 31 x 49 mm/1.2 x 1.9 oz. Package list: 1 x solar panel controller charging module. Package List