[Charge Anywhere] Transfer sunshine into electricity, charge and maintain your 12 volt battery in all seasons. The most advanced MPPT(Maximum Power Point Tracking) chip intelligently manage charging and fully protect battery. US PATENT PENDING! [Intelligent Charge & Maintain] Built-in intelligent MPPT charge controller, generates at least 10%-20% more power than traditional controller. Smart 3-stages charging algorithm is improved to better charge and maintain battery in all seasons. [Full Protections] Prevent battery from over charge, over voltage, discharge and short circuit, reversed polarity protection, waterproof and sparkproof, battery is fully protected. [Visual Monitor] The LED indicator helps to visually monitor the working status, better understand battery conditions- Flash in Green, output normal; Flash in Red, Charging normal; Solid Green, Battery is full; Solid Red, Error. [Free Maintenance] Tempered glass and strong ABS frame, well built for years. Come with 3-piece SAE cable kits, plug and play, easy to use. No electricity cost, free maintenance for outdoor usage.