Philips SBA3210/37 User Manual page 6

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The power indicator turns off when it's fully charged.
Play
1 Connect your two speakers with supplied cable.
2 Connect your device to the speaker.
3 Slide the switch to turn the speaker on.
» The power indicator turns on.
4 Adjust the volume and navigate your audio content on your device.
5 After use,disconnect your device from the speaker and slide the
switch to turn the speaker off.