1)Applicable ipod, laptop, MP3 mobile phones, MP3, MP4 2)power amplifier, electronic sound volume, Fashion mini IPHONE speaker(JYD-668) Applicable ipod the broadcast and chargingApply to the laptop computer, MP3 mobile phones, MP3, MP4 broadcastApply to handheld game, learning machine broadcastApply to CD, VCD, DVD broadcastFunctions:1. The active power amplifier, electronic sound volume, high ...