T6 Solar Bluetooth Portable Speaker IPX5 - Dual Speakers With Microphone

SKU: GW54.0016

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Hello, when the speaker battery is lower than 10%, the speaker will give an intermittent warning buzzer reminder..... you need to charge it. 
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Yes you can. However, when doing so, there should be at least 25% or so remaing charge, and at a moderate volume. Otherwise you will out pace the charge. Keep in mind, this speaker has an INCREDIBLE long battery life. Far more than stated. 
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No, you can't sync two of these to use. 
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Built in. Only need sun or plug in charger ( it comes with one) to power up.