Solar-Powered: Rock Solar Bluetooth Speaker can be charged outdoors. It takes approximately 30 hours to fully charge under sunlight (while it only takes 2 hours via a power cord). Solar charging and power cord charging can be carried out simultaneously, with a maximum power peak of 160W (1Pair), 40W (1Pair) Rated power. When fully charged and at full power, it can work for up to 5 hours, and when used at 80% power, it can last for up to 7 hours. IPX7 Waterproof: Outdoor Rock Solar Bluetooth Wireless Speaker features an IPX7 waterproof design. Its construction can withstand rain, temperature changes, and other harsh weather conditions without affecting its power.