I just got one for $10 at a yard sale 😁 Can you believe it? Although I think it could be a knock-off, it did sync to my env. I didn't charge it that much, the sound wasn't all that bad. I'm going to try it on a full charge, the range was about 10' with a 15 min charge. Anyone have one of these? How can I tell if it's fake(aside from getting it at a yardsale)?