The "Boost Charge Pro 3in1 Charger Qi2 (15 W)" from Belkin is primarily designed for Apple devices, but it also supports other Qi-compatible devices.

- It offers 15W fast wireless charging for Qi2-compatible devices, which includes many Samsung mobiles that support Qi wireless charging, such as the Samsung Galaxy S23.
- However, compatibility is not explicitly mentioned for the Samsung Smartwatch 7 Ultra, as these chargers are mainly optimised for Apple Watch and AirPods. However, it is possible that the smartwatch can be charged via the USB-C port if it has a corresponding cable, but the wireless charging function is not guaranteed.

Overall, it is therefore likely that the Galaxy S23 can be charged wirelessly, but compatibility with the Samsung Smartwatch 7 Ultra is not certain and depends on the specific ports and compatibility features of the smartwatch.