... :50mm 4ohms4. Frequency Response: 150-20KHz5. Battery capacity: 800mAh Function:1. Portable and small design.2. Button: Power on/off, prev, next ... , music mobile, laptop, iPod.5. With remote controller6. Built-in Lithium battery.7. LED diaplay screen.8.3 power supply modes: Built ... -in Lithium battery, connect to PC by USB port, DC adapter.9. Support ...