Product details:

EcoFlows 220W Bifacial Portable Solar Panel is two in one. With a 220W primary side, and a 155W side on the back for ambient light, you can capture up to 25% more solar energy and charge your portable power station even faster. Try a mirrored surface and you can get up to 80% more energy.220W solar panel + EcoFlow RIVER – 3.2 hours
2x 220W solar panel + EcoFlow RIVER Max – 2.9 hours
2x 220 solar panel + EcoFlow DELTA – 4.3 hours