Is Bluetooth 6.0 better than Bluetooth 5.3?

The version number mostly covers how devices connect, not sound quality. Audio still runs over codecs like SBC, AAC or LDAC, and none are listed here. A newer version does not by itself mean better range or fewer dropouts.

How long does the battery last?

No battery figure is given. ANC over-ear headphones from known brands typically run 30 to 40 hours with ANC on, but this model makes no claim, so assume nothing until a review measures it.

Can I connect two devices at once?

Multipoint pairing is not listed. Many budget headphones support only one device at a time, so expect to disconnect before switching between a phone and a laptop.

Does it work with a cable when the battery dies?

No wired mode or included cable is stated. If the battery runs out, the headphones may simply stop working until recharged.

How does it compare with the Sony WH-1000XM5?

The Sony has measured ANC, a stated 30-hour battery, multipoint and app EQ. This pair lists only ANC and Bluetooth 6.0, so it is the riskier pick unless independent reviews show its noise cancelling holds up.