Sony’s wh-1000xm4 is the new successor to the wh-1000xm3. A new leak hints at what to expect from Sony’s wireless headphones.

The code hints that the M4 headphones may be able to simultaneously pair with two devices. On the current model, you have to reconnect if you want to use a different device.

The M4 may also include a feature called’smart talking,’ which allows the headphones to detect voices. Its predecessor has something similar called ambient sound mode, which lets you hear sounds while wearing the headphones.

The xm3 will be able to change some (if not all) headphone settings based on your location (set locations or your own) and uses Google Maps API for it.

bimages of what the headphones could look like also surfaced from the teardown. They appear very similar to the M3, as previous leaks showed.

The leak included photos of the M4, which look slightly thicker than the M3. The new headphones may include longer battery life, possibly hitting the 40-hour range on a single charge – four hours up from its predecessor’s typical battery life.