... Input: 5V/1000mA power adapter (optional), USB power supply and built-in lithium battery (included USB power cable) In the ... , ready to use playback pause, adjust volume, select the song up and down song Audio Size: 5 * 5 * 5cm Aluminum body, ... elegant appearance, unique design, so sound quality is better Clean and pure sound qualityLaptop speakers, phone speaker preferredChildren listen to stories ...