HighlightsSoundPro Bluetooth Multi-Link Solar Rechargeable Wireless Rock SpeakerSpecificationBrand - SoundProDetailsEasy set up with Bluetooth® and completely wireless. Pair with any Bluetooth® enabled device to one and run up to 99 of the same speakers all playing the same music. Fully self-contained internal rechargeable battery with both solar or USB recharge options.Fill your backyard, patio, or pool area with rich, fabulous sound remaining unaffected by the elements.SoundPro® 4000 speakers