Used for iPhone iPod PC,MP3,MP4,Computer,etc
Built-in active amplifier
Mellow and clear timbre
Pure and elegant sound quality with unsurpassed effect in compliance with acoustics and aestetics rationale
Flexible sound with distinct tone levels
Output power: 6 W (3 W * 2)
Frequency response range: 150-18 KHz (+ 3 dB)
SNR: 80 dB
Horn specification: 1.77 inches (45 mm diameter) impedance: 4 Europe
Audio input: 3.5 stereo audio input, USB, SD/MMC Card disk supported

The power supply mode: rechargeable built-in lithium battery, cable for charging from USB port of computer, USB input computer
* external 5V power adapter can be also used for charging but not included & can be purchased separately - here)

Li-ion battery voltage: 3.7 V
Li-ion battery recharging voltage: 4.2-5V
Li-ion battery capacity: 500 mAh