Using PERC Cells Structure Technology (Low Resistance Characteristics), Output Power Of 60pcs Monocrystalline Cells Reaches Max 450W (Highest Conversion Efficiency To 20.9%)  Item NO:400W Mono Min order: 10 ShippingPort: Guangzhou/Shenzhen, China Original Region: China Lead Time: About 15 working days Warranty: 25 Years Number of Cells: 54pcs Efficiency: > 19.3% Certification: EST, UL, CE Material: Monocrystalline Silicon