Headphone amplifier powerful stereo for phone earphone music improver audio portable 3.5mm mini rechargeable black hifi home Description:100% brand new and high quality.Compact, lightweight, ultra-thin and portable HiFi headphone amplifier, help you enjoy high-definition clear and stereo stereo without distortion.Butterworth circuit design, Butterworth automatically adjusts the height and bass dynamically,increasing sound density3.5mm AUX Input and Output, Rechargeable lithium battery, can keep working for a long time.Just plug and play, without any unnecessary switches or buttons, easy to use.Widely compatible for a variety of digital devices, such as MP3 MP4 mobile computers, headphones, powered speakers, etc.Specification:Type: Headphone AmplifierColor: BlackSize: 2.1x0.43x0.86inch(L*T*W)Battery capacity: 120 mAOutput power: 300mw * 2/16Frequency response: 2-27KHZSignal to noise ratio: SNR: 95DBDynamic range: 90DBResolution: 70DBDistortion: (THD + N) 0.006%Input impedance: 32Output impedance: 200Working temperature: -40 C ~ 60 CCharging time: 40minsStandby time: 200hoursPackage Included:1 x Headphone Amplifier1 x USB cable1 x Conversion Line1 x English User ManualNote:1. Due to the light and screen difference, the item's color may be slightly different from the pictures.2. Please allow 1-3cm differences due to manual measurement.