I am amazed with the great sound quality from such a small unit. Don't be fooled by the small size. It has good volume and clarity. It has a built-in 1500mAh lithium polymer battery. Its power lasts up to 20h while connected to audio cable and up to 10h while in Bluetooth operation mode. Because it is so small and portable, I can take it wherever I go. I can take it to friend's place or family's place or even outside the house, whether you are doing some gardening, going on a picnic, or even in the car. It's a great gift for those who enjoy listening to music wherever they want and whenever they want.