About this item ?【Portable & Charge Anywhere】- Lightweight and portable solar charger. Transfer sunshine into electricity, charge and maintain different 12V battery such as flooded, gel, AGM, SLA, VRLA, lithium-ion battery of RV, car, boat, marine, automotive, snowmobiles, etc. in all seasons. US PATENT PENDING! ?【Intelligent Charge & Maintain】- Fully protect the battery! Built-in intelligent MPPT controller, generates at least 20%-30% more power than the other controller. Smart 3-stages charging algorithm effectively prevents the battery from over-charge, over-voltage, discharge, short circuit, etc. ?【Upgraded Visual Monitor】- The colorful LED indicator helps to visually monitor working status of the charging. Charging will be cut off automatically when battery is fully charge, and resumed when battery goes flat, totally free maintenance. ?【Waterproof & Hign quality Materials】- Use 30% high conversion efficiency crystalline silicon material + high-strength solar energy glass which has 95% strong light transmittance and waterproof performance, can withstand harsh weather conditions. ?【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. Backed by extended 12 months warranty + lifetime technical supports.