... diameter 45mm) magnetic resistant 4 Ohms Power supply: 5V/1000mA, AC power adapter, USB power rotate connect line(can choose)more explanations ... it is praised as masterwork of audio boxes.New mini aluminum vibration film loud speaker, which has clear alt and ... You can enjoy sweet stereo sound product from the aluminum speaker. Several power supply manners including battery, computer USB, adaptor DC-5 ...