[Mini HiFi Headphone Amplifier] Exquisite, compact, , portable, easy to carry[3.5mm AUX input and output] 3.5mm AUX input and output, signal-to-noise ratio 120dB and +N 0.0003%, not only output louder, more realistic stereo, no distortion.[Aluminum matte ] The stylish design provides you with a comfortable hand-held feeling, while the aluminum matte makes it .[Rechargeable lithium battery] Adopts rechargeable lithium battery with a capacity of 1500m AH, which can work continuously for more than 8 hours.[Wide and compact] It is significantly compatible with a variety of digital devices, such as MP3, MP 4, mobile phones and computers (Tip: It is not recommended to use it while charging, because current interference occur during charging, which may cause noise)Color:BlackMaterial:Aluminum AlloyPackage Contents:1 * Headphone AmplifierOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.