Is the low latency mode good enough for competitive gaming?

It narrows the audio delay compared with standard Bluetooth, which helps for casual mobile play. It will not match a wired headset or a 2.4 GHz dongle for timing-critical games.

Can I use it for calls and voice chat?

Yes. It has a built-in microphone, so it works for phone calls and in-game chat. Call quality is basic, as on most budget earbuds.

Does it have noise cancellation?

No. There is no active noise cancellation, so outside noise comes through. The sealed in-ear fit gives some passive isolation.

What Bluetooth version does it use?

Bluetooth 5.0. That is stable and widely compatible, but older than the 5.2 and 5.3 chips in newer earbuds.

Can I connect it to a console or PC?

It pairs over standard Bluetooth, so a Bluetooth-enabled PC or phone works. Consoles like the Switch need a Bluetooth adapter, and the low-latency benefit is smaller there.