Renz offers parcel box units attached to the front of homes, where the deliverer can leave and safely store the parcel. A parcel box unit can be used to send parcels in addition to receiving them. An electronic control unit informs users about the status of deliveries via text or e-mail, and controls the collection of parcels from the parcel box unit. This transparent system means the unit can be operated by all parcel delivery services. Now owners can add cool lockers to myRENZbox parcel box units; they can be set at different temperatures to keep food fresh, cold or frozen.