Is the Sea Kraken 39mm a good size for small wrists?

Yes. At 39mm the case is compact for a dive watch and sits well on wrists that feel overwhelmed by 42mm or larger divers. It is a sensible pick if you want a diver without a bulky presence.

Does it need a battery?

No. It runs on a mechanical automatic movement wound by the motion of your wrist. If you leave it off for a few days it will stop and need setting and a few turns to restart.

How does it compare with the Glycine Combat Sub?

The Sea Kraken is the smaller, more compact option at 39mm, while Combat Sub models generally run larger. Choose the Sea Kraken if you want a lighter, less bulky fit; choose a Combat Sub if you prefer a bigger dive-watch presence.

Is it a real dive watch?

It is styled as a dive watch with an analog dial and rotating-bezel look, but check the rated water resistance before swimming or diving. Treat it as a sports watch unless the rating is confirmed.

What movement does it use?

It uses a mechanical automatic movement, meaning it is self-winding and does not use a battery. Automatic movements typically need servicing every few years.

Does it come with a metal bracelet or a strap?

That depends on the version you choose. Check the specific listing for whether it is supplied on a bracelet, rubber strap or leather strap before buying.