I bought a BT1 from Revain to install in my Vocopro Mobileman. It works well when the karaoke system has more than 40% power. If the battery drops below 40%, the Bluetooth connection will drop and everything else will work, including the microphone. The Vocopro Mobleman's battery lasts about two hours. BT1 lasts just over an hour. However, it is very easy to install and connect to my laptops and tablets, as well as my Bluetooth TV. BT1 always works when the karaoke machine is plugged into a wall outlet.
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