How do I manually turn on the A90 Pro earbuds if they have powered off automatically?
If the earbuds are not connected to a device for more than 5 minutes, they will automatically turn off. To turn them back on manually, press the MFB button for about 3 seconds until you hear the 'Power on' voice prompt. (Page 6)
From the official Btootos A90 Pro Wireless Earbud Bluetooth Earbuds manual, page 6
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