Place these speakers outdoors for solar charging. It takes a full day of direct sunlight to fully charge the solar outdoor Bluetooth speakers with solar panels (4-5 hours via power cord). The rock speakers will charge on cloudy or sunny days. The speakers can also be charged using the included rechargeable mini-USB cable (Note: You can charge the battery for 6 to 8 hours before using the product to avoid the Bluetooth speaker not connecting properly due to lack of power).
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