An electrical power transmitting controller device for using in a host device to transmit electrical power to an electrical power receiving controller device of an accessory device, comprising: - a power delivering terminal to provide electrical power, wherein the power delivering terminal is arranged to be coupled to the electrical power receiving controller device of the accessory device, - wherein the electrical power transmitting controller device is arranged to detect whether the electrical power receiving controller device of the accessory device is coupled to the power delivering terminal, and whether the accessory device is arranged to be supplied with electrical power from the electrical power transmitting controller device to be operated, - wherein the electrical power transmitting controller device is arranged to provide electrical power at the power delivering terminal, if the electrical power transmitting controller device detects that the electrical power receiving controller device of the accessory device is coupled to the power delivering terminal and that the accessory device to be operated is arranged to be supplied with power from the electrical power transmitting controller device, - wherein the power delivering terminal is arranged to provide and receive communication data, - wherein the electrical power transmitting controller device is arranged to detect whether the accessory device being configured to receive no power or bias power or being configured as an intelligent accessory device being arranged to receive communication data coded by a data communication protocol, - wherein the electrical power transmitting controller device is arranged to provide and receive the communication data coded by the data communication protocol at the power delivering terminal, if the electrical power transmitting controller device detects that the accessory device is arranged to exchange the communication data coded by the data communication protocol, - wherein the power transmitting controller device is arranged to detect the voltage and power requirements of the accessory device and to generate the required electrical power, if the electrical power transmitting controller device detects that the accessory device is connected to the power delivering terminal and the accessory device is detected as an intelligent accessory with the capability to be power supplied from the electrical power transmitting controller device. - a power delivering terminal to provide electrical power, wherein the power delivering terminal is arranged to be coupled to the electrical power receiving controller device of the accessory device, - wherein the electrical power transmitting controller device is arranged to detect whether the electrical power receiving controller device of the accessory device is coupled to the power delivering terminal, and whether the accessory device is arranged to be supplied with electrical power from the electrical power transmitting controller device to be operated, - wherein the electrical power transmitting controller device is arranged to provide electrical power at the power delivering terminal, if the electrical power transmitting controller device detects that the electrical power receiving controller device of the accessory device is coupled to the power delivering terminal and that the accessory device to be operated is arranged to be supplied with power from the electrical power transmitting controller device, - wherein the power delivering terminal is arranged to provide and receive communication data, - wherein the electrical power transmitting controller device is arranged to detect whether the accessory device being configured to receive no power or bias power or being configured as an intelligent accessory device being arranged to receive communication data coded by a data communication protocol, - wherein the electrical power transmitting controller device is arranged to provide and receive the communication data coded by the data communication protocol at the power delivering terminal, if the electrical power transmitting controller device detects that the accessory device is arranged to exchange the communication data coded by the data communication protocol, - wherein the power transmitting controller device is arranged to detect the voltage and power requirements of the accessory device and to generate the required electrical power, if the electrical power transmitting controller device detects that the accessory device is connected to the power delivering terminal and the accessory device is detected as an intelligent accessory with the capability to be power supplied from the electrical power transmitting controller device.