Kids fitbit/smart watch recommendations?

[IamChipmunk]

As the title...
Can anyone recommend a fitbit/smart watch for an 8yo. He wants to count steps particularly and see the time. Waterproof probably best.
It doesnt need to be branded.
Looking at around £30 max.

I've got one in my amazon basket but it doesn't have brilliant reviews and will wait to see what comes up for prime but thought someone may be able to suggest one.

The Fitbit Ace is designed for children but has less features than other Fitbit models.

If going for Fitbit then I’d get one of the adult models (possibly second hand?) rather than the Ace.

I’m sure there are good alternatives to Fitbit, but I don’t know enough details to make a recommendation.

My 8 year old wears a kids Garmin- works well and he likes the game in the app