Features Adopting top for red ring output inductance no output consumption more pure sound voiceFull allumnium alloy body gold plated RCA and crystal loudspeaker line column more gorgeousAdopts Germany MKP10 as output more rich overtoneAdopts high speed capacitor array Lower internal resistor dynamic more violentGold plated RCA port output Taiwan imported sealed potentiometer thicken allumnium alloy radiating Note 1 Do not use cheap audio signal cables these cables are without shieldiing they will lead in high frequency noises2 The bigger the rotation the larger the noises3 The correct using sequence is firstconnect laptop power with amp power supply port then charge the laptop Power Voltage 12V 8ohm loudspeaker 12W left channel 20W left channel 12W right channel 4ohm loudspeaker 20 left channel 15V 8 ohm 18 18W 4ohm larger than 30 30W19V 8 ohm 32 32W 4 ohm larger than 45 45W24V 8 ohm 38 38W 4 ohm larger than 55 55W Packaged Included 1 x Breeze Audio TPA3116 Digital Amplifier no power adapter