A dimmer device for controlling the amount of power delivered to an electrical load by an AC power source the dimmer device is configured to be coupled to, the dimmer device comprising a dimmer control button for performing a conventional dimming function, the dimmer device furthermore being adapted for operating according to at least one customizable operating characteristic and comprising a memory for storing and retrieving selected values for the customizable operating characteristic or for an adjustable dim variable linked thereto, wherein the dimmer control button is furthermore adapted to, in a configuration mode, control the selection and adjusting of the at least one customizable operating characteristic of the dimmer device, different from the conventional dimming function, as a result of the execution of a sequence of pressing and rotation actions on said dimmer control button by a user, such that no additional components other than said dimmer control button are required for controlling said one or more customizable operating characteristics, wherein said customizable operating characteristics comprise one or more of a minimum dim level mode for setting a minimum amount of power delivered to the electrical load, maximum dim level mode for setting a maximum amount of power delivered to the electrical load that may not be exceeded, a boost mode for driving the electrical load at a stored power level in case the electrical load requires a high level of initial energy in order to start properly, wherein the pressing actions of the dimmer control by the user are timed, wherein the dimmer device is adapted to distinguish among different timings of the timed pressing actions of the dimmer control button by the user, wherein the timed pressing actions are selectable among short, long and very long timings, and the at least one customizable operating characteristic of the dimmer device is selectable by a first timed pressing action on the dimmer control button and the customizable operating characteristic is adjusted by a rotation action on the dimmer control button after the first timed pressing, characterized in that the rotation action being within a range of angles stored in the memory and linked to the at least one customizable operating characteristic, and that the dimmer device is configured to store a customizable operating characteristic or a value of the corresponding dim variable in the memory after a second timed pressing action (317, 318) on the dimmer control button. the dimmer device furthermore being adapted for operating according to at least one customizable operating characteristic and comprising a memory for storing and retrieving selected values for the customizable operating characteristic or for an adjustable dim variable linked thereto, wherein the dimmer control button is furthermore adapted to, in a configuration mode, control the selection and adjusting of the at least one customizable operating characteristic of the dimmer device, different from the conventional dimming function, as a result of the execution of a sequence of pressing and rotation actions on said dimmer control button by a user, such that no additional components other than said dimmer control button are required for controlling said one or more customizable operating characteristics, wherein said customizable operating characteristics comprise one or more of a minimum dim level mode for setting a minimum amount of power delivered to the electrical load, maximum dim level mode for setting a maximum amount of power delivered to the electrical load that may not be exceeded, a boost mode for driving the electrical load at a stored power level in case the electrical load requires a high level of initial energy in order to start properly, wherein the pressing actions of the dimmer control by the user are timed, wherein the dimmer device is adapted to distinguish among different timings of the timed pressing actions of the dimmer control button by the user, wherein the timed pressing actions are selectable among short, long and very long timings, and the at least one customizable operating characteristic of the dimmer device is selectable by a first timed pressing action on the dimmer control button and the customizable operating characteristic is adjusted by a rotation action on the dimmer control button after the first timed pressing, characterized in that the rotation action being within a range of angles stored in the memory and linked to the at least one customizable operating characteristic, and that the dimmer device is configured to store a customizable operating characteristic or a value of the corresponding dim variable in the memory after a second timed pressing action (317, 318) on the dimmer control button.