... Input: 5V/1000mA power adapter (optional), USB power supply and built-in lithium battery (included USB power cable) In the ... appearance, unique design, so sound quality is better Clean and pure sound qualityLaptop speakers, phone speaker preferredChildren listen to stories ... standard 3.5mmLINE IN audio input line, do mobile phones, laptops, desktops, MP3 \ MP4 external speakers.Speakers can be accessed ...