Hearing aid comprising a left-right location detector

A hearing aid configured to be located at or in a first ear of a user, the hearing aid comprising

• a heartbeat detector providing a pulse control signal indicative of a time variation of said user's heartbeat at said first ear of the user, and
• a processor,
• wherein the hearing aid is configured receive a second pulse control signal from a second hearing aid configured to be located at or in a second ear of the user, wherein said second pulse control signal is indicative of a time variation of said user's heartbeat at said second ear of the user;
• wherein the processor is configured to estimate whether said hearing aid is located at a left or a right ear of the user in dependence of said pulse control signal and said second pulse control signal;
• wherein the hearing aid is configured to perform the estimating of whether said hearing aid is located at a left or a right ear of the user in response to a specific criterion, which relates to the reliability of the pulse control signal, being fulfilled;
• and
• wherein the specific criterion comprises any one or combination of the following:
• the user is not moving,
• the user is not talking, and
• background noise is not above a predetermined level.