A lot of mixed reviews concerning this model of speaker. Wasn't sure what to expect and I bought of two these for the stereo effect as they will be used together in a large hall. I took away the bass settings and used them with an android phone with Muzio player app installed which has a customisable equaliser included. I set the equaliser to the rock setting and let the speakers play at half volume for each speaker. These are very good speakers and produce a good sound when used with a equaliser. I tried them with all kinds of music including rock, opera, jazz, vocals etc and I was pleasantly surprised. I am a audiophile and am very fussy when it comes to good quality sound. These speakers are better than what I expected and I will definitely be keeping them. After about two hours use at half volume settings the speakers dropped to 90% battery level. At that rate I should get about twenty hours use before they need charging. When it comes to pairing read the instructions and where they say that you need to press speaker ones button twice then press the button very quickly twice. If you press the button slowly then it won't pair. Once you know what you're doing then pairing the speakers will be quick and very easy. Be advised that I wasn't that keen on the sound straight out of the box but with two speakers being used with a equaliser app they're really good. Would definitely buy again.