That’s exactly right – it keeps recording at all times, even without your mobile, and syncs as soon as Bluetooth is switched on again. At night, for example, you can switch your mobile off.
Yes, that is correct: There is no clock display because the device does not have a screen. It records data in the background, and the analysis is performed later via the app on the smartphone.
Yes, the device can record HRV and display it in the app. According to Google/Fitbit, heart rate variability is calculated from heart rate data and appears in the Google Health app under Vital Signs or Heart Rate Variability; this usually requires sufficient sleep data, and the measurement is based on the longest sleep phase of the last 24 hours.
Important: It is more of a wellness and trend value than a full-fledged Whoop replacement. HRV in Fitbit is linked to sleep and daily evaluation, not to a continuous, sport-focused recovery system like Whoop.
If you want, I can also briefly explain which Whoop functions are missing here and which are roughly similar.
The designation "EU" stands for the European version (packaging, instructions, CE conformity).
This means that there are no restrictions on the hardware. Google officially states that the Fitbit Ace LTE and certain services are only supported in the USA.