This is a simple widget (not an app) to connect/disconnect from A2DP Bluetooth sinks. That is all it does.
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Install from Play Store
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Pair your Bluetooth devices using Android settings
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Turn Bluetooth ON
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Place an instance of this widget on your home screen (launcher dependent on how you do this)
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Click it to connect a device, again to disconnect.
The widget will connect if the device is currently not connected, and disconnect if the device is currently connected.