Wearable electronic device

A method of determining of at least one of a size of a dose or of an operational status of a handheld injection device, the handheld injection device comprising a click noise generator configured to generate a mechanical vibration or an acoustic noise during operation of the handheld injection device, the method comprising:

• attaching a wearable electronic device to a portion of a body of a user, wherein the wearable electronic device comprises a housing, a processor arranged inside the housing, and at least a first sensor connected to the processor and configured to detect at least one of a mechanical vibration or an acoustic noise,
• bringing the handheld injection device in mechanical contact with the body of the user,
• detecting at least one of
• i) a vibration of a skin of a user caused or generated by the click noise generator and
• ii) a sound wave caused or generated by the click noise generator (45) and transmitted through a portion of a body of a user
• by the at least first sensor of the wearable electronic device, and
• determining or deriving at least one of a size of a dose and an operational status of the handheld injection device based on signals obtained from the at least first sensor in response to the detection of mechanical vibration or acoustic noise.

A non-transitory computer-readable medium having computer-readable instructions stored thereon for determining at least one of a size of a dose and an operational status of a handheld injection device, the handheld injection device comprising a click noise generator configured to generate a mechanical vibration or an acoustic noise during setting of a dose or during dispensing of a dose, wherein when the handheld injection device is in mechanical contact with a body of a user, and when a wearable electronic device is a attached to a body portion of the user, the computer-readable instructions, when implemented by one or more processors of the wearable electronic device, cause the one or more processors to:

• detect at least one of
• i) a vibration of a skin of a user caused or generated by the click noise generator and
• ii) a sound wave caused or generated by the click noise generator (45) and transmitted through a portion of a body of a user
• by an at least first sensor of the wearable electronic device,
• analyze electrical signals obtained from the least first sensor during an operation of the handheld injection device, and
• determine or derive at least one of a size of a dose or of an operational status of the handheld injection device on the basis of the analysis of the electrical signals obtained from the at least first sensor,
• wherein the wearable electronic device comprises a housing, the one or more processors arranged inside the housing, and the at least first sensor connected to the one or more processors and configured to detect the at least one of the mechanical vibration or the acoustic noise caused or generated by the click noise generator of the handheld injection device.