You don’t have to worry about changing batteries in your OMRON Blood Pressure Monitor if you have the AC Adapter. This OMRON AC Adapter works for many of the upper arm blood pressure monitors for convenient replacement of a lost or broken AC Adapter. AC adapter compatible with Omron Blood Pressure Monitor models HEM-7120/ HEM-7121/ HEM-7130/ JPN-500/ JPN-600/ JPN1/ JPN2/ HEM-7156/ HEM-7156A/ HEM-7361T/ HEM-7130-LAP/ HEM-7320/ HEM-7280T/ HBP-1120