[Updates below⤵]Great sound. Apparently will pair with another for both ears; need another to do it... Don't know yet if that's stereo.Works well for phone calls.Does not control volume from devices; the Bluetooth attached device(s) must have their own volume/equalizer adjustments.Battery charge lasts all night & recharge takes about an hour on Mini-usb.Great little device. Quite small.(I'll try to update this review.)Update: A week on & still happy. I wanted a monaural ear bud. Fits the bill. Volume adjustment would be a plus, but not a problem.Fits inside of headphones cuff.Second Update: Approximately 1hr to charge; listen to music/video/calls lasts 6hrs+ [Pop on charger 10 mins & get an hour of play time..!] Ordered another for myself for Xmas (got Wife some brand-names); I'll let y'all know if it pairs stereo.Third Update (lol): Ok... So I got a second one, & it pairs, in stereo, automatically, after 1st following of directions, to the one I bought earlier this year. [I paired them together first, then paired the set to my cell phone.] Audio is excellent, and in true definable stereo. I determined which is L vs R channel, & it seems stable each pairing.No transparency, independent volume control, or other frills, but I'll give them ⭐⭐⭐⭐⭐. Surprisingly good quality.The quick charging & long play times are astounding.Recommended purchase.