Changes

Since the first release, Apple Watches include a heart rate sensor and accelerometers/gyroscopes for [[activity tracking]]. Since 2020, some Apple Watch models can also do rudimentary [[sleep tracking]].   

Since the first release, Apple Watches include a heart rate sensor and accelerometers/gyroscopes for [[activity tracking]]. Since 2020, some Apple Watch models can also do rudimentary [[sleep tracking]].   

Since the 4th generation, Apple Watches also include an [[ECG]] sensor that can be used to take manual readings and since the 6th generation they it includes a [[Oxygen saturation|Blood oxygen]] sensor, though this has been disabled in recent models sold in the USA due to patent issues<ref>https://www.theverge.com/2024/1/17/24041945/apple-watch-series-9-ultra-2-blood-oxygen-ban</ref>.   

Since the 4th generation, Apple Watches also include an [[ECG]] sensor that can be used to take manual readings and since the 6th generation they it includes a [[Oxygen saturation|Blood oxygen]] sensor, though this has been disabled in recent models sold in the USA due to patent issues<ref name=":0">https://www.theverge.com/2024/1/17/24041945/apple-watch-series-9-ultra-2-blood-oxygen-ban</ref>.   

Beyond this, the Apple Watch also uses its microphone to regularly record environmental noise levels.  

Beyond this, the Apple Watch also uses its microphone to regularly record environmental noise levels.  

|No

|No

| colspan="2" |Yes

| colspan="2" |Yes

| colspan="2" |Yes (Disabled for U.S. models sold from January 18, 2024)

| colspan="2" |Yes (Disabled for U.S. models sold from January 18, 2024)<ref name=":0" />

|-

|-

![[Body temperature tracking|Temperature sensor]]

![[Body temperature tracking|Temperature sensor]]