The original 2nd Edition entry from the Forge.

The Necklace of Easy Breathing prevents the wearer from dying from asphyxiation. There must be air available to breath for this item to work. It will not work in a vacuum or underwater. It will however protect the wearer against strangulation, cloudkill, stinking cloud, and any other type of attack that effects the lungs.

As submitted to the site's 3e section; shown unchanged.

The Necklace of Easy Breathing prevents the wearer from dying from asphyxiation. There must be air available to breath for this item to work. It will not work in a vacuum or underwater. It will however protect the wearer against strangulation, cloudkill, stinking cloud, and any other type of attack that effects the lungs.

Caster Level: 3rd; Prerequisites: Craft Wondrous Item, endurance; Market Price: 11,400 gp.