Simply hold this magic ring in your hotbar to enable its effects. The effects don't stack with other rings' effects.
The ring can be anywhere in your hotbar, and you can even wear armour!
The ring's abilities:
If you take any damage from any source, the invisibility is lost for 10 seconds. It comes back straight after the 10 seconds are up.
If you deal melee damage to a mob, the invisibility is lost for 5 seconds. It comes back straight after the 5 seconds are up.
While you are invisible, a sprinting particle effect will appear at your feet and no other potion effects can be used.