... your mobile, MP3 / MP4 laptops etc. support SD, music files automatic playback FM Radio CE;RoHS;FCC Hotselling Mini ... / MP4 laptops etc digital products, support SD, music files automatic playback, built-in FM radio module, can store 30 channels external replaceable ... : 150-18000HZ (+ 3dB)Power input: DC 5V / 1000MAFunctions:Digital amplifier, built-in MICRO SD/lithium battery, decoded play function ...