Speaker  case1) compatible with IPOD, MP3/MP4 player, Mobile phone and other gadgets from scratching Or damaging2) Suitable for camping, sporting .. Etc outdoor using,Colordo as customers requirement.a, Impedance: 4 Ohmb, Frequency response: 275 HZ-20KHzc, Power output: 3W*1
d, Battery usage: DC 3.0 V/AA battery *2e, Sensitivity: >= 85dB
f, THD : < 0.3% g, SNR, S/N: >= 50dB 

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