Smartwatches typically have non-removable batteries to maintain a slim profile and water resistance.

Smartwatches can use Wi-Fi, Bluetooth, or cellular connectivity to pair with smartphones, depending on the model and features.

Sleep tracking is a common health-tracking feature found in smartwatches, allowing users to monitor their sleep patterns and quality.

NFC in smartwatches is primarily used for making contactless payments through services like Apple Pay or Google Pay.

Wear OS is Google's smartwatch operating system, formerly known as Android Wear.

The gyroscope in a smartwatch is used to detect motion and orientation, enabling features like step counting and gesture control.

Cellular connectivity in smartwatches enables users to make and receive phone calls without the need for a nearby smartphone.

The ambient light sensor in a smartwatch adjusts the screen brightness based on the surrounding light conditions.

Home automation control in smartwatches allows users to control smart home devices like lights, thermostats, and door locks.

Weather forecasts are typically not displayed as notifications on smartwatches, but rather as a dedicated weather app or widget.

The barometer in a smartwatch is used to measure altitude, which can be useful for activities like hiking or skiing.

Menstrual cycle tracking is a feature found in some smartwatches, allowing users to track their menstrual cycle and fertility.

The accelerometer in a smartwatch is used to detect motion and orientation, enabling features like step counting and gesture control.

Music storage and playback in smartwatches allows users to listen to music without the need for a nearby smartphone.

The magnetometer in a smartwatch is used for compass navigation, helping users determine their direction.