I ordered a Bluetooth set with a nano earpiece two weeks ago (just in time for my exam). The reseller (by the way, it is www.gsm-earpiece.com) promises that nano earpiece works for about 7 hours, heck, know what, 1 hous as maximum!!! When I phoned to their support they tried to calm me down and offered two batteries for free, I refused and asked a refund. Well, they returned my money in the end but on the exam I had looots of problem because of them!!! From now on I will make orders only from trustable companies!!