Key with light device for an electromechanical locking device

An electromechanical locking device and a key for the electromechanical locking device,

• wherein the key comprises a key bow,
• wherein the key bow comprises a light device,
• and wherein the key bow comprises electronics which are designed to actuate the light device to reproduce at least one item of information in a luminous manner,
• wherein the key is designed to enter into a wireless communication connection with a device, wherein the electronics are designed to display a search for the communication connection and/or an existing communication connection as information by way of the light device by actuating the light device,
• wherein the key comprises an electrical energy storage device, wherein the electronics are designed to represent a charge status of the energy storage device as information by actuating the light device,
• wherein the information about the energy storage device is represented in a different color than the information about the connection of the key to the device,
• wherein the electronics are designed to represent at least as information the absence of an access authorization using the light device by actuating the light device and the electronics are designed to represent information about the connection of the key to the device in a different color than the absence of an access authorization by actuating the light device,
• wherein if there is no electronic access authorization, then a cylinder core cannot be rotated in a housing of the locking device.