Cover an entire outdoor area with great sound - without any wiring! Outdoor music makes any occasion a special event, whether it is a backyard barbeque or a family birthday party. Solar Rock Multi-Sync allows you to stream and control your music wirelessly up to 100ft through any Bluetooth~~-enabled device. With its high-power 30-watt sound system, the 6.5-inch speaker delivers clear, vibrant sound. The Multi-Sync Technology feature allows you to easily control up to 100 ION Audio linked speakers to really amplify your outdoor sound experience. Keep the party going non-stop, thanks to the built-in rechargeable battery that can be charged by the embedded Solar Panel or via AC power, IPX5 waterproof design, and the ION Sound XP App to control the audio. ION Audio Solar Rock Multi-Sync is exactly what you need for getting great sound in any outdoor space.