... , Accord with bluetooth V2.1 +EDR(A2DP) Bluetooth specification b, Transmission range:<10Mc, USB charging voltage :DC 5Vd, Output ... Li-ion Battery 3.7V/450MAf, Battery Lifetime : 4 hours G: play music wirelessly H.: 3.5mm audio input I : ... 7cm8.Quantity per CTN:10PCS9.N.W:2.05kg10.G.W:3.65kg11.carton size(L*W*H)33 ... 1 yearsFor more details .,Please contact me hands free Wireless bluetooth speaker for MP3