Headphone Amplifier Powerful Stereo For Phone Earphone Music Improver The product is shipped based on the color or size of the main image of the product page. Headphone amplifier powerful stereo for phone earphone music improver audio portable 3.5mm mini rechargeable black hifi home Description:100% brand 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 items color may be slightly different from the pictures.2. Please allow 1-3cm differences due to manual measurement.