Stylus pens are not typically used with smartwatches, as they do not have touchscreens that require a stylus.

Smartwatch screen protectors are designed to protect the screen from damage caused by scratches, cracks, and other impacts.

Solar charging is not a common feature of smartwatch charging docks, as smartwatches typically do not have built-in solar panels.

Smartwatch watch bands serve multiple purposes, including holding the smartwatch securely on the wrist, providing a comfortable fit, and adding a personal style to the smartwatch.

Temperature sensors are not as common as fitness trackers, heart rate monitors, and GPS trackers as smartwatch add-ons.

Smartwatch fitness trackers are designed to track various fitness-related metrics, including steps taken, calories burned, and distance traveled.

Electrical heart rate monitors are not typically used in smartwatches, as they require direct contact with the skin and are not suitable for continuous monitoring.

Smartwatch GPS trackers are designed to track various location-related metrics, including the location of the smartwatch, its speed, and its elevation.

NFC payment chips are not as common as cellular connectivity modules, Wi-Fi connectivity modules, and Bluetooth connectivity modules as smartwatch add-ons.

Smartwatch NFC payment chips are primarily designed to allow the smartwatch to make contactless payments at NFC-enabled payment terminals.

5G modules are not as common as LTE modules, 3G modules, and 2G modules in smartwatch cellular connectivity modules.

Smartwatch cellular connectivity modules allow the smartwatch to make phone calls, send and receive text messages, and access the internet without being connected to a smartphone.

802.11ac modules are not as common as 802.11b modules, 802.11g modules, and 802.11n modules in smartwatch Wi-Fi connectivity modules.

Smartwatch Wi-Fi connectivity modules allow the smartwatch to connect to Wi-Fi networks, transfer data wirelessly, and communicate with other Wi-Fi-enabled devices.

Bluetooth 5.0 modules are not as common as Bluetooth 4.0 modules, Bluetooth 4.1 modules, and Bluetooth 4.2 modules in smartwatch Bluetooth connectivity modules.