Three Power Levels to Switch On. For faster, more efficient solar charging, the 5W panel boosts ccharging speed by 60% compared to 3W, while the 8W panel delivers 1.6x the power for maximum endurancee. Chew-Proof Cable Option Available. A standard cable for everyday use and a metal-wrapped cablee for extra durability against rodents. Suitable for All Birdfy Feeders. Compatible with all Birdfy Feeders The 5W and 8W versions coome with a Y-branch connector which can charge two cameras at once, perfect for your Birdfy Feeder 2 Duo!