Mono Solar Panal Product features: Our solar panels are assembled by high efficient crystalline silicon cells from our own fab. With or without screw frame design, strong mechanical resistance. High transmission low iron tempered glass, strong mechanical resistance. Standard waterproof junction box, with bypass diode, which protects the module from burning caused by hot-spot effect because of shading. High endurance to different atrocious weather, passed the IEC61215 & IEC61730 performance test and UL1703 safety test. 5-years quality guarantee and 10-25-years power output guarantee.