A monitor, for use with an absorbent article having a wetness sensor, includes a power management system. The monitor may include a hinge, a housing, and a power management system. The power management system may include an integrally activated and deactivated power circuit. The power circuit includes a first contact associated with the hinge and a second contact associated with the housing. The first contact is electrically connected with the second contact when the monitor is in a closed condition. The first contact is electrically disconnected with the second contact when the monitor is in an open condition. A monitor having a power management system may further include an attachment circuit and/or a continuity circuit.