While wearing this belt, you gain the following benefits:
Dwarvish
You know Dwarvish.
Friend of Dwarvenkind
You have Advantage on Charisma (Persuasion) checks made to interact with dwarves and duergar.
Toughness
Your Constitution increases by 2, to a maximum of 20.
In addition, while attuned to the belt, you have a 50% chance each day at dawn of growing a full beard if you can grow one, or a thicker beard if you already have one.
If you aren't a dwarf or duergar, you gain the following additional benefits while wearing the belt:
Darkvision
You have Darkvision with a range of 60 feet.
Resilience
You have Resistance to Poison damage. You also have Advantage on saving throws you make to avoid or end the Poisoned condition.