20 WATT SOLAR PANEL - CONSTRUCTED IN A HEAVY-DUTY ANODIZED ALUMINUM CHANNEL FRAME THAT PROVIDES A CONVENIENT MOUNTING LOCATION AND ADDS STRENGTH TO THE PANEL - THE CELLS ARE LAMINATED BETWEEN HIGH TRANSMISSIVITY, LOW-IRON, 3MM TEMPERED GLASS AND SHEET TEDLAR-POLYESTER-TEDLAR (TPT) MATERIAL BY TWO SHEETS OF ETHYLENE VINYL ACETATE (EVA) - FURTHER SEALED BY A LAYER OF SILICONE CAULKING BETWEEN THE PANEL AND THE FRAME - THIS CONSTRUCTION METHOD PROTECTS AGAINST MOISTURE PENETRATING INTO THE MODULE - A SOLDER TAB ELECTRICAL CONNECTION IS ON THE BACK OF THE PANEL, PROTECTED BY A SMALL PLASTIC BOX - YOU WILL NEED A CHARGE CONTROLLER IN ORDER TO USE THE PANEL TO CHARGE A BATTERY