A process for the conversion of an alcohol mixture may include introducing into a reactor a stream including the alcohol mixture mixed with a stream including olefins having 4 carbon atoms or more. The up-converter generates a very low voltage over the LED array without making use of a transformer. The call devices are capable of performing call communications, such as according to a Session Initiation Protocol or an H. A skin shadow point and an eyeball point of the face are extracted from the skin area, the shadow point having a lowest brightness in the skin area. The inductive RF coupler and the RF inductor are cooperatively configured to function as the windings of an RF transformer, thus achieving the desired coupling.