The bracelet has five charges. After all five charges are used, it turns to dust. Players can use a charge of the bracelet to become immune to damage caused by Revenants for one minute, as well remove their aggression for one hour. The removal of aggression helps Revenant farming considerably as they won't cast spells on you before you attack one, and then only the one you attack will fight back. This stops Revenants stealing your combat focus while in single-way wilderness combat mode and removes the added damage of magic spam while in Multi-Way combat mode.
The bracelet also keeps you from being skulled when entering the Abyss. Each time you enter uses up one charge.
Alchemy spells will always provide the same number of coins when used on the bracelet regardless of how many charges it has left. Many players use four of the five charges and then sell the item back to the grand exchange or cast high alchemy on it to recover most of its cost.
An additional ability was added to the bracelet for it to protect against Revenants' teleport block. If a player came under the effect of a teleport block cast by an NPC then, by equipping the bracelet, they could teleport despite the block; providing that they are below level 20/30 Wilderness depending upon teleport method used. However, if instead the teleport block spell was cast by another player, rather than by an NPC, equipping the Forinthry bracelet did not cancel the spell's effect. This effect of the bracelet was determined at the moment the player attempts to teleport. Equipping the bracelet did not ward off or cancel the teleport block spell itself, it simply inhibited the spell's effect while being worn. So, a player needed only equip it immediately prior to teleporting. If they unequip the bracelet whilst teleport blocked then the spell's effect was restored for the remaining normal duration (5 minutes from cast).
After the Wilderness and Free Trade update, the ability for the Forinthry bracelet to repel Revenants and give a temporary immunity from their damage was added. The anti-teleport block ability was removed, as Revenants no longer cast it.
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