The Electronic Device - The RebiSmart™ is an electronic injection device that is being studied for the delivery of Merck Serono's Rebif® New Formulation. The RebiSmart™ device is a stand-alone hand-held device with internal power supply. It is used for subcutaneous (under the skin) injections with single-use sterile disposable needles. The device will be kept in a storage box and placed in the refrigerator after each use.