I made a little experiment with my iphone 7, buwizz and bluetooth speaker. I connected speaker with my iphone and slowly increase range between me with phone and my speaker. After 20 meter, I was at the end of the corridor (the place where i testing whole things), but my speaker still played very well. I need to notice that i was surrounded by many others WiFi networks. Unfortunately my 2 buwizzs still have range less than 5 meters. When i walk with my Rally Car, it seems to be ok, no disconnections at all, but u need to be in range so 1-3 meters behind car. Second issue that i noticed is when i turn on ludicrous mode, after 3-5 sec and less than 2m range it will disconnect, one of buwizz start to blink and suggest that it need to recharge. Even if i will plug in powerbank nothing really is going to change it still rapidly disconnect when ludicrous mode is on.