I bought a Bluetooth to audio (RCA) adapter from Amazon to use with an old receiver at my wife small business. However, the adapter did not keep reliable Bluetooth connection. I have had to reconnect Bluetooth at least once a week. I have considered buying Sherwood RX4508, which has Bluetooth 3.0, but kept debating about it. This simple receiver has very similar look and spec with the Sherwood receiver (especially the connector layout in the back of both is almost identical). When BB had it on sale for less than $100, I thought why not give it a try. It is a better deal than the Sherwood and it comes with a remote control. We use an Android tablet to stream music from internet and connect to this receiver thru Bluetooth. It has been a month and the Bluetooth connection has not disconnected once. My wife business has 4 speakers on the ceiling and we don't need any fancy sound. This receiver works great for our need. Like other reviewers have noted, it is not hot at all comparing to 5 other receiver I have owned. By the way, there is no where in the manual, on the box, BB or Insignia website telling the version of the Bluetooth. I guess it has Bluetooth 3.0 like the Sherwood receiver. If it has Bluetooth 4.0, they would printed some where. However, this is not a mobile device, therefore there is no need to has newer Bluetooth 4.0 version since the big difference between 3.0 and 4.0 is power consuming.