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as BT adapters goes i would put this one at the top of the class. the DAC and BT 5 (with the lossless codecs) can pull great detail out of your music. the power is where i would want just a bit more, to get my 5th star. for almost any portable headphone this will be enough power, but anything more demanding than say the 4XX you will want more power. 660's may be able to run enough for most people, but lets be honest; here on this section of MD we want all the volume on everything. it does come with the IEM adapter so you can run high efficiency monitors (from BW this is an add-on) so you get the adapter plus the IEM adapter for a good discount. mine did have an issue where the green light would not come on to indicate the battery was fully charged. i contacted BW support and they had me do a factory reset and download and install a firmware update. so if you charge yours for hours and still can't get a green status light try that. (press the reset button then press and hold the two arrow buttons till the blue stops blinking quickly. then don't plug anything in or turn on for at least 20 minutes (yes they said 20 minutes) then charge the device again and you should be able to get a green light. the firmware is on their site. (windows only (.exe file).
Thanks for your input and review. I Believe Stephanie our After sale representative might have had a small inattention mistake. The correct precautious delay after a reinitialization is 20 sec, not 20 minutes.