ARCELI HiFi Headphone Amplifier Portable 35mm Audio Earphone Headphone Amplifier with Aluminum Matte Surface Ideal for MP3 MP4 Phones Digital Players and Computers

Specifications: Output power: >=600mW (32 ohms) Adapted headphone impedance: 16-300 ohms Total harmonic distortion: <0.005% Signal to noise ratio: >=120DB Frequency response: 10-30K Hz Life time: >6 hours (generally: 6-9 hours) Built-in polymer lithium capacity: 8.8Wh (3.7V/2400mAH) Charging interface: Standard MICRO USB 5V Charging current: 500-550mA (using slow charging method - to ensure the maximum battery life) Volume: 103*61*13.5 (length * width * height) --- maximum size (including knob) Weight: machine net weight: 96g List: 1* host 2* amp strap 1* USB charging cable