How long does the battery really last?

JBL rates it at 76 hours, and that figure holds with noise cancelling on. Real-world use with calls and higher volume will be lower, but it still outlasts most rivals by a wide margin.

How good is the noise cancelling?

It is solid for engine, fan and road noise, which suits commuting and flights. It is not as strong as flagship ANC headphones at blocking nearby conversation.

Yes, a detachable cable lets you listen wired when the battery runs out or on flights with seatback audio. Bluetooth remains the main mode.

Is it good for calls?

The built-in microphones handle calls and video meetings fine in quiet rooms. In windy or crowded places, callers may hear background noise.

Does it work with two devices at once?

Yes, multipoint Bluetooth lets you stay connected to a phone and a laptop and switch between them.

Is it worth it over the cheaper JBL Tune models?

The 780NC adds active noise cancelling and a longer battery rating over the base Tune line. If you commute or fly often, the ANC is the reason to step up.