1.portable speaker PS4003 2.d-class amplifier. 3.factory price. 4.high fidelity sound. 5 ... , competitive price, prompt delivery, great service and solid reputation. 2)original package with tags and labels 3)fast samples delivery4 ... volume, random music)Li Battery Capacity400mAHBattery Voltage3.7VBattery Charging Voltage4.2~5VBattery Charging TimeAbout 3 HoursRating Power2W+2WPower Supply InputMINI USB ...