There was a small problem with the bluetooth connection, but not fatal. I read that I need high-quality usb cables, I came up with a complete one from the nokia 5310 phone. I myself play on batteries, I bought a pack (4 pieces) right away, while I play on some, others are charging and waiting in the wings. When the charge runs out, the vibration stops working, a convenient solution for notifying you of a low charge.
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