The WLAN means that no SIM card can be used in the watch. In fact, the only difference between the two watches is the colour, otherwise they are technically the same.

The watch offers the following functions: - Listen to music directly from the watch: yes, the watch has a music function and can store up to 500 songs. - Measure altitude metres (stair climbing etc.): The watch measures changes in altitude, which could be relevant for stair running. - Daily training suggestions: This function is not explicitly mentioned in the information provided. - Garmin Coach for strength training: This specific function is not listed in the information provided.

The Garmin Forerunner 255 Music watch does not have an integrated phone function that allows you to make or receive calls directly from the watch. However, it can display notifications from your smartphone and provide other functions such as music control and data synchronisation via the Garmin Connect app, but there is no speaker or microphone for phone calls.

Yes, the Garmin Forerunner 255 Music can receive and display WhatsApp messages and other notifications. - WhatsApp and text messages: You can receive WhatsApp messages and other text messages on your watch and even reply with predefined responses as long as the watch is connected to your smartphone via Bluetooth. - Other notifications: The device also supports notifications from other apps, including calendars, calls, emails and more. You can display these notifications directly on your watch and even customise the display and behaviour of the notifications, such as the duration they appear on the screen or whether they are displayed by a gesture or the start button.

According to the operating instructions, a connection is only possible with a smartphone or via the app: https://www8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/DE-DE/GUID-7F4154D6-D3DB-46D4-B2C8-6AA97589D6AE.html

This would normally be a 46mm model.