One or more properties' values changed. The D-Bus interface of the changed properties. The changed property names and their new values. One or more properties value changed; this signal implements the D-Bus specification's PropertiesChanged signal. The D-Bus interface of the changed properties. The changed property names and their new values. Properties which are now invalid, but for which the new value is not emitted in this signal. Clients interested in these properties should issue a Get request for them to retrieve the new value.