... foldable speaker, portable speaker, gift speaker, USB speaker, mobile speaker, computer speaker, laptop speaker, promotion speaker, Ipod speaker, Speaker for IPod, Speaker for MP3unit size: 53(dia)x36mmFeature and function :- Folding mini speaker work ... output: 2W ; - Frequency Range: 100Hz-20KHz- Input Sensitivity: 500mv – 1.5v- Signal-to-noise Ratio: ≥60dB; - Channel separation : ≥40dB- impedance ...