... with built in amplifier 1.Phone,MP3,iphone,PCspeaker 2.In battery and external battery slot 3.FM,Clock,alarm SU-22 mini speaker with built in ... amplifier FM,clock,alarm Description:1.Mini speaker built in amplifier support any ... 4Ω6.3.5mm Stereo Audio Jack7.Built-in 500MAH rechargeable Li-ion battery8.Rechargeable ... SU-22 mini speaker with built in amplifier FM,clock,alarm