How long does the battery really last?

OneOdio rates it at up to 110 hours of wireless playtime. That figure assumes moderate volume; loud listening and dual-device pairing will shorten it.

Yes. It has a 3.5mm jack with an anti-off locking design, so it works as a wired headphone when the battery is empty or for low-latency monitoring.

Does it have noise cancelling?

No. It is a passive closed-back headphone, so it blocks some sound but has no active noise cancellation.

Can it connect to two devices at once?

Yes. Bluetooth 5.2 lets it pair with two devices, such as a phone and a laptop, and switch between them.

What is Hi-Res Audio certification worth here?

It means the headphones are certified for high-resolution playback over the wired connection. Over Bluetooth, codec support limits quality to standard levels.

Is it good for studio work?

It works as a wired monitoring headphone with large 50mm drivers, but it is not a flat reference model and lacks the accuracy of dedicated studio headphones.