The Longi HI-MO4 Mono 370W is a powerful and stylish solar panel. High-quality modular technology offers excellent efficiency and long-term reliability. Black frame. Material warranty 12 years, power output warranty 25 years. Made in China. Half Cut (HC) single-crystal solar panels produce electricity efficiently and with high efficiency even with less solar radiation power and in hot conditions. Half Cut panels produce less waste heat and more electricity.