An array of object paths for devices. Enumerate all power objects on the system. Object path of device that was added. Emitted when a device is added. Object path of device that was removed. Emitted when a device is removed. Object path of device that was changed. Emitted when a device changed. If we are on battery power. Emitted when the main power source of the system has changed. If we are critically low on battery power. Emitted when the main power source of the system is critically low in power. If we are on battery power. Finds out if we are using battery so we can make policy decisions, for instance not running the indexer when we are on battery power. If we are critically low on battery power. Finds out if we are critically low on battery so we can make policy decisions, for instance saving documents or turning off network connections. Suspends the computer into a low power state. System state is not preserved if the power is lost. Hibernates the computer into a low power state. System state is preserved if the power is lost.