This product supports Tri-Band equalization. The sound is clear and warm. If you like to adjust different sound band that suits your musical experience preference? This is the perfect choice between your player and music system and will improve the sound of all your music.

Features:
Compact size and full metal shell? portable and durable.
Tri-band tone control: Treble? Middle? Bass.
Audio channel balance control.
Independent opamp for each channel to minimize the crosstalk.
Direct switch for bypass hardware tone control.
3.5mm headphone output & Line output; two 3.5mm Line inputs for stereo audio source.
Built-in 2200mAh rechargeable lithium polymer battery? and charged via the USB cable.

Specifications:
Treble:
- Control Range: 3KHz-20KHz
- Trim Range: -12dB to +12dB
- Center Freq: 18KHz
Middle:
- Control Range: 200Hz-4KHz
- Trim Range: -10dB to +10dB
- Center Freq: 1KHz
Bass:
- Control Range: 20Hz-250Hz
- Trim Range: -14dB to +14dB
- Center Freq: 20Hz
SNR: around 112dB
Stereo Crosstalk: -90dB
THD: 0.003%
Headphone Drive Ability: 16-600ohm
Max. Headphone Output Power: around 270mW/16ohm; 450mW/32ohm at 1KHz
Power Supply: Built-in 2200mah rechargeable Lithium Polymer battery
Item Size: 11.5 * 3.8 * 6cm/ 4.5 * 1.5 * 2.4in
Item Weight: 256g / 9oz

Package List:
1 * Headphone Amplifier
1 * USB Charging Cable
1 * User Manual(English)