The FlexPwr Brick™ is designed to function properly with an input power of 10-28VAC (ungrounded) or 12-32V DC (grounded or ungrounded). A 2-pin header (Phoenix Contact #1881448)style connector is used for the power input. The 12VAC, 600mA wall transformer provided with the product provides a floating power source that has been designed to eliminate any ground loops through the power supply connection.