Samlex America Solar SRV-100-30A All-in-One Solar Charging Kit Reinforced Solar Glass - The high-transparency low-iron tempered glass allows maximum light permeability while enhancing stiffness and impact resistance Advanced Cell Encapsulation - The interconnected cells are embedded in ultra transparent EVA with multilayer backsheets for additional weather protection Optimized Module Surface Area - The distance between the frame edge and the cell circuitry iscalculated according to the electrical output optimization Charge controller has battery equalization which restores battery capacity, revives efficiency and extends battery life digital display shows charging stage, voltage, current and battery Amp Hours Aluminum mounting brackets are accompanied with leak-proof fasteners that expand to prevent moisture from getting inside your RV