Specification:
<br />Color: Multicolor
<br />Material: Plastic + metal + electronic components
<br />Input voltage: AC 12V, 0.8A /5.5*2.5 (mm) plug
<br />Channel type: 2.0 Stereo
<br />Knob function: Power switch / volume adjustment
<br />Product size: 7.7 * 7.5 * 5.2cm
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<br />Instructions:
<br />1. AC 12V input:
<br />Using DC5.5 * 2.1 socket, 12V AC power adapter is available, you can also use 12V AC transformer, if you use 12V AC transformer, power lines need to solder on the circuit board. Remember: You can NOT use a DC power input, otherwise it does not work!
<br />2. The left-channel input / right channel input:
<br />Audio signal input, can be connected to mobile phones, computers, M3, MP4, and other music players.
<br />3. The left channel output / right channel output:
<br />The audio signal output terminal can be connected to the audio signal input amplifier, power amplifier boards.
<br />4. The power switch / volume knob:
<br />The knob counter-clockwise to turn down the volume beginning, when the volume down to the minimum, if it continues to rotate until the "ticking" sound, then the power off, the light goes off.
<br />In the off state, turn the knob clockwise to hear "tick" sound, light is on, the power is turned on, then the volume is minimal, then continue clockwise rotation is to increase the volume.
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<br />Packing List: 
<br />8 x Electrolytic Capacitor 470UF / 35V 
<br />4 x Film Capacitor 1.0UF / 50V 
<br />1 x Electrolytic Capacitor 16V / 470UF 
<br />2 x Transistor D667 
<br />7 x Transistor B647 
<br />1 x Double Potentiometer 50K 
<br />5 x Diode 1N4007 
<br />2 x Tube 6J1 
<br />1 x Tube Holder 
<br />2 x RCA Socket 
<br />1 x Power Outlet
<br />2 x Light-emitting Diode Blue 
<br />1 x Resistance 2.2 ohm 2W 
<br />6 x Resistance 4.7k 
<br />2 x Resistance 1K 
<br />4 x Resistance 47 ohm 
<br />2 x Resistance 2.2K 
<br />2 x Resistance 470K 
<br />2 x Resistance 200 ohm 
<br />2 x Resistance 100k
<br />1 x PCB