Description If you are looking for a professional and affordable adjustable headphone amplifier, then your research is over here. That's because our product can meet your need. Adopted of premium material, it is practical and durable for long time use. It is not easy to get deformed and bring you much convenience. Features -Color:Black -Material:aluminum-Size:9.50X6.20X1.50cm/ 3.73X2.44X0.59inInput/Output Port: 3.5mm Audio Port Distortion: 0.004% SNR: 120dB Load impedance: 16-150 Max. 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 - This HiFi headphone amplifier supports impedance 16-150 ohms, can provide remarkable sound output without distortion.- Delicate, compact and portable, which makes it more convenient to carry.- High-quality audio, suitable for your mobile phone, music player, laptop, computer, and etc.- 3.5mm AUX input and output, easy to connect with different devices.- Special design and it is in fine craftsmanship. It is the best replacement for your old, broken one. Packing list: 1 x headphone amplifier1 x power cable1 x audio cable