Portable HiFi Headset Amplifier Headphones Amp

Features:
Mini HiFi Headphone Amplifier: Mini size design, lightweight and portable, very convenient to carry around; full metal shell, durable and sturdy.
High-quality Sound Output: 3.5mm output jack for connecting headphone or speaker, 3 partition isolation circuit and 2 operational amplifier sets provide you with top sound quality.
Supports Volume Adjustment: With a volume control knob on the front panel, you can adjust volume levels from 0 to 9, easy to operate.
Supports Multiple Devices: 3.5mm input jack design make it compatible with various of digital devices, such as MP3 player, smartphone, tablet, computer, etc.
Built-in Rechargeable Battery: Built-in 2100mAh large capacity lithium battery and can be recharged via the micro USB interface; with 1A USB power output interface, the amplifier can be a backup power for your smartphone or other devices.