HQRP USB 5V to DC 9V / 12V Step-Up Converter Cable for Sony MDR-IF330 MDR-RF930K
(HQRP® Step-Up Converter;. HQRP trademarked products. Output: DC 9V or 12V, 1000mA;. Input: 5V USB;. Sony MDR-IF330, MDR-RF930K. This warranty is not transferable. South Korea. Arrived quickly and working, very happy ;-).