Accessory USA AC Adapter Charger Power Supply for Omron HEM-780 HEM-780N2 HEM-780N3 HEM-790IT 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 : 6V 1A