1.Audio bass amplifier,saving energy; 2.With storable 3.5mm jack cable; 3.Ideal for gifts and promotional items; 4.OEM 1.Minimum order quantity:60pcs/ctn 2.Battery:Lithium Battery/1pcs ,3.7V800mA , With FM Radio Functions 3.Charging Time:3Hr-5Hr4.Power Supply:DC5V,USB 5.Output power :2.5W*2(RMS 6.Output Impedance:4OHM 7.Play Format for USB:MP1,MP2,MP38.Read Data Support Bitrate:32kbps-320kbps ...