How do I know which strap width fits my watch?

What matters is not the case size but the gap between the lugs, measured in millimetres — most often 18, 20 or 22 mm. Measure between the lugs with a ruler, or check the watch's specification. Apple Watch and some Samsung models use their own fitting, so they need a strap made for that model.

Does a smartwatch need its own SIM card?

Most do not. Standard models connect to the phone over Bluetooth and use its connection. A separate eSIM is only needed on LTE versions, if you want to take calls and messages with the phone left at home.

What does a watch's water resistance actually mean?

5 ATM means the watch will survive rain, washing your hands and swimming in a pool, but not diving or a hot shower — steam damages the seals. IP68 means protection against dust and brief immersion, but it is not meant for swimming. Leather straps do not survive water even when the watch does.

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Xiaomi 17 Ultra Black 6.9 " LTPO AMOLED 1200 x 2608 pixels Qualcomm Snapdragon 8 Elite Gen 5 (3 nm) Internal RAM 16 GB 512 GB Dual SIM 3G 4G 5G Main camera resolution 50 MP Secondary camera resolution 50 MP Android 16 6800 mAh

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Xiaomi 17 Ultra Black 6.9 " LTPO AMOLED 1200 x 2608 pixels Qualcomm Snapdragon 8 Elite Gen 5 (3 nm) Internal RAM 16 GB 512 GB Dual SIM 3G 4G 5G Main camera resolution 50 MP Secondary camera resolution 50 MP Android 16 6800 mAh

Name: Xiaomi 17 Ultra Black 6.9 " LTPO AMOLED 1200 x 2608 pixels Qualcomm Snapdragon 8 Elite Gen 5 (3 nm) Internal RAM 16 GB 512 GB Dual SIM 3G 4G 5G Mai...
Brand: Xiaomi
SKU: 6985390
Price: 1579.99 EUR
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SKU: 6932554483654

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Xiaomi 17 Ultra Black 6.9 " LTPO AMOLED 1200 x 2608 pixels Qualcomm Snapdragon 8 Elite Gen 5 (3 nm) Internal RAM 16 GB 512 GB Dual SIM 3G 4G 5G Main camera resolution 50 MP Secondary camera resolution 50 MP Android 16 6800 mAh

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