Hello there. This 9W Wireless Charger Pad is Qi certified. As such, the Galaxy Watch Active has been listed as Qi compatible, and able to use this charger. The Galaxy Buds have also been listed as wireless charger capable with access to this charger. Results may very. For verification, links to the original specifications as listed on Samsung.com have been provided for all three products.
https://www.samsung.com/us/mobile/mobile-accessories/phones/wireless-charger-pad-2018--white-ep-p3100twegus/
https://www.samsung.com/us/mobile/wearables/smartwatches/galaxy-watch-active-40mm-black-sm-r500nzkaxar/ https://www.samsung.com/us/mobile/audio/headphones/galaxy-buds--white-sm-r170nzwaxar/ ^Thomas