... panel features:1. The modules use high-quality imported polycrystalline or Mono crystalline solar cells; Enclosed by high-rigidity tempered glass,Website:http:// ... and corrosion.3. The efficiency of our mono crystalline solar cell is over 17%, and polycrystalline panel is over 16%. We stipulate, ... is strictly tested before leaving the factory.4. Our solar panel is designed with a lifetime of 25 years, ...