Are you looking for a professional, yet adjustable headphone amplifier? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? , ! Our adjustable headphone amplifier must meet your needs. It is one of the for you. Features -Color: Black -Material: aluminum -Size: 9.50X6.20X1.50cm/3.73X2.44X0.59in Input/Output Port: 3.5mm Audio Port Distortion: 0.004% SNR: >=120dB Load impedance: 16-150 Power output: 250mW in Impedance 16 Amp Internal Voltage: ±4V Charging voltage: DC 5V Frequency response: 20Hz-20kHz(±3dB) Lithium-Battery capacity: 1000mAh Amp Using Time: about 6 Hours - Improve audio signal input into the amplifier circuit for better performance of the headphones. - 3.5mm input and output design, it is compatible with phone, computer, laptop, and etc. - Small and compact size, light in weight, you can carry and use it wherever you go. - workmanship, reasonable structure, professional and practical, can bring you convenience. - It is simple in design, but very practical in use, which brings great convenience to you. Package list: 1 x headphone amplifier 1 cable 1 cable