Questions about Huawei Band 4e

I just used this watch for 10 nights. No alarms linked to the sleep phases (but I don't remember well ...). It was for a long time ! I just know that you have to install the Huawei app store, then get the app. You can get a graph with your sleep phase. But I tested two watches (low price - one at each arm) during some nights and obtained each night different graphs from the watches. I think that not an useful product ! Best regards

According to my research, the device is used together with the HUAWEI Health app.

A mobile phone and the corresponding app are useful for setting up the device. It is also useful for updating the tracker from time to time. Once set up, however, the band can be used without a mobile phone and if you don't feel the need for updates, you will never have to connect it again.