Watchstrap connectable to a smartwatch, the watchstrap comprising at least: a main body for coupling with an arm of a human being, wherein the main body has at least two ends, wherein a first end comprises a first coupling means connectable to a smartwatch housing and a second end comprises a second coupling means connectable to said smartwatch housing, characterized in that the watchstrap further comprises: at least one unit configured to transform a constant voltage inputted via said first coupling means into digital data, wherein the unit comprises three or more than three different voltage divider circuits (4a, 4b, 4c), wherein the constant voltage is fed to each of the three or more than three different voltage divider circuits, wherein said voltage divider circuits (4a, 4b, 4c) are configured to provide respective output voltages, wherein the unit further comprises at least an ADC block configured to convert said respective output voltages into digital data, wherein said digital data corresponds to predefined operation values representing a color based on the red, green and blue, RGB, model, wherein the watchstrap is configured to transfer said digital data via said first coupling means to the smartwatch, such that a smartwatch illumination color is adjusted in dependency of the digital data. a main body for coupling with an arm of a human being, wherein the main body has at least two ends, wherein a first end comprises a first coupling means connectable to a smartwatch housing and a second end comprises a second coupling means connectable to said smartwatch housing, characterized in that the watchstrap further comprises: at least one unit configured to transform a constant voltage inputted via said first coupling means into digital data, wherein the unit comprises three or more than three different voltage divider circuits (4a, 4b, 4c), wherein the constant voltage is fed to each of the three or more than three different voltage divider circuits, wherein said voltage divider circuits (4a, 4b, 4c) are configured to provide respective output voltages, wherein the unit further comprises at least an ADC block configured to convert said respective output voltages into digital data, wherein said digital data corresponds to predefined operation values representing a color based on the red, green and blue, RGB, model, wherein the watchstrap is configured to transfer said digital data via said first coupling means to the smartwatch, such that a smartwatch illumination color is adjusted in dependency of the digital data. at least one unit configured to transform a constant voltage inputted via said first coupling means into digital data, wherein the unit comprises three or more than three different voltage divider circuits (4a, 4b, 4c), wherein the constant voltage is fed to each of the three or more than three different voltage divider circuits, wherein said voltage divider circuits (4a, 4b, 4c) are configured to provide respective output voltages, wherein the unit further comprises at least an ADC block configured to convert said respective output voltages into digital data, wherein said digital data corresponds to predefined operation values representing a color based on the red, green and blue, RGB, model, wherein the watchstrap is configured to transfer said digital data via said first coupling means to the smartwatch, such that a smartwatch illumination color is adjusted in dependency of the digital data.