Solar Panel 400-watt mono panels are made of A-grade mono perk cells and ultra cleared tempered glass and that glass protects the panel and does not break easily and gives up to 20% higher efficiency even in low light and cloudy weather. This mono perc crystalline panel technology includes 72 cells 5 busbars and 25 years of performance warranty. IP 67 rated junction box is given with an MC4 compatible cable connector.