Disclosed are an earpiece and a headset comprising an earpiece, where the earpiece is configured to be arranged at least partly in an ear of a user. The earpiece comprising a heart rate measurement unit for measuring the heart rate in/at the ear of the user; a receiving member configured for accommodating and/or receiving a detachable speaker unit of the headset; and a detachable speaker unit which is configured to be inserted and/or attached and removed and/detached from the receiving member of the earpiece.