Kinter MA-150 2-Channel Car Audio Mini Amplifier AMP with 5V USB Charger and Tera Cloth for CD DVD MP3 High quality RCA input and output adapter for multi usages. With LED power light. Three audio modes switcher. High and low voice levels control. 5V USB socket charging for cellphone or MP3. Input voltage:9-15V DC. Frequency response: 20Hz~20KHz. Suitable for CD, DVD or MP3, etc. The USB charger is only used for charging, but NOT for playing music from U-disk.