Original Black Bose Sounddock I Power Supply PSM36W-208 +/- 18V Series I AC Adapter with Four Prong Plug Black PSM36W-208 with Four Prong Plug Fast Shipping from Seattle WA Output: +/-18 VDC 1 A with Four Prong (Second Picture) Compatible with Bose Sounddock I (Series I) with four prong female plug only Input 100~240 VAC