Hello The Vivosmart lasts 7 days for me. I have switched off the wake-up function. Display only lights up when I actively press the button. I wear the Vivosmart under my shirt on the right and a "real" watch on the left.

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The Garmin Vivosmart 5 can track some activities without the smartphone, but there are some limitations that are relevant to your needs: - GPS tracking: the Vivosmart 5 does not have a built-in GPS function. To track your running route, you need to connect the device to your smartphone and use the smartphone's GPS function. - Music playback: The Vivosmart 5 supports music playback, but you must first load the music onto the device. However, there is no storage for large music libraries and the control of music playback without a smartphone is limited. To summarise: For tracking your running route and listening to music without the smartphone, you are not fully covered with the Vivosmart 5 as the device relies on the smartphone for the GPS function.

Yes, Bluetooth on the Garmin Vivosmart 5 can be turned on and off. This can typically be managed through the device's settings or via the Garmin Connect app on your paired smartphone.

It can vibrate and display various messages.

The "Garmin Connect" app and a Garmin account are required on the mobile phone, both of which are free of charge. The data is then synchronised from the Vivosmart to the app and is therefore visible on the mobile phone and also in the Garmin Connect portal, which can be accessed via an internet browser.

The heart rate measurement (and also the step counting function) also works without the app/mobile. However, the app is required to set up the tracker (including time).

No, it is not. The tracker only records. I don't know if a tracker can do that. But there are specific sleep phase alarm clocks - you can simply google them.

No. It uses Bluetooth.

On the manufacturer's site I found this info: "The L size is 223 mm (8.8 inches) long and has a circumference of 148 to 215 mm (5.8 to 8.5 inches)." Source: https://www.garmin.com/de-DE/p/782585/pn/010-02645-14

Ca 21cm

According to Garmin, sleep monitoring (sleep score and insights) is available on the Garmin Vivosmart 5.

I have only been using the new model for a few days. So far, the battery life seems to be similar to vivosmart 4. Have you perhaps activated the all-day PulseOxi measurement?

This would be the matching replacement wristband in black, in size S/M: Garmin wristband for vivosmart 5 S/M (silicone)

No, the Garmin website says it has connected GPS. With Bluetooth as a smart feature.