iPod touch 4, iPod touch 5,iPhone 4/4S, iPhone 5, iPad 2/iPad 3/iPad 4/iPad mini, Samsung and other devices * Connect the product with iPad original power adapter via USB cable, then connect the iPad original power adapter into AC Power. * When enjoying iPad horizontal screen or insert othe audio equipment , connect the line-in cable to the line in port of the back speaker, turn on the power switch for playing the audio(It will automatically cut off DOCK 1 & DOCK 2 when using line in port to play the audio.) * iPad, iPhone using the audio amplifier, the inputting audio can be changed byt the audio switcht (with corresponding LED indicates the current input source, DOCK1 is blue light, DOCK2 is green light ), you can press Volume "+; -" control the volume in playing. * When charging for iPad iPhone,Open the speaker power switch(power light is white), now could use speaker power amplifier.