Accessory USA AC Adapter For WD My Book Essential WDBACW0030HBK Charger Power Supply Cord PSU Products trademarked Accessory USA are marketed and sold exclusively by Accessory USA Store. Warranty:30 days Money Back Promised/60 Days Free Exchange With Paid Return Label/365 Days Anytime Worry-Free Warranty!**100% MONEY BACK GUARANTEE !! IF OUR PRODUCT CAN NOT WORK WELL** Output : 12V 2A