FIDE Laws "11.3.2 During a game, a player is forbidden to have any electronic device not specifically approved by the arbiter in the playing venue." The FIDE Anti-Cheating Regs also list "wallets, smart glasses, pens, watches" as 'forbidden gadgets'.
I did ask an arbiter during the game whether watches were allowed, and he clarified that smartwatches were banned, but not analog watches. This seems to be against FIDE rules for events of this stature










