Collar of the Eternal BondEquipment 7
Source Pathfinder Secrets of Magic
Price 330 gp
Weight light
When you invest this collar for your eidolon, it changes its appearance to match the eidolon's form, possibly into a different sort of neckpiece such as a choker, and it glows brightly with the symbol you and your eidolon share. While your eidolon wears a collar of the eternal bond, the collar bolsters their connection to you, allowing them to move up to 150 feet from you before unmanifesting instead of 100 feet. The eidolon can also Activate the collar to move even further.
Activate 
envision
Frequency once per day
Effect Your eidolon focuses their will on the collar, allowing the collar to maintain the connection between you at any distance. For the next 5 minutes, you and your eidolon can move any distance from each other without your eidolon unmanifesting. When the duration ends, if your eidolon is more than 150 feet from you, they immediately unmanifest.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
ConjurationEffects and magic items with this trait are associated with the conjuration school of magic, typically involving summoning, creation, teleportation, or moving things from place to place.
EidolonA creature with this trait is a summoner's eidolon. An item with this trait can be worn by an eidolon. An eidolon can have up to two items invested.
InvestedA character can wear only 10 magical items that have the invested trait. None of the magical effects of the item apply if the character hasn't invested it, nor can it be activated, though the character still gains any normal benefits from wearing the physical item (like a hat keeping rain off their head).
MagicalSomething with the magical trait is imbued with magical energies not tied to a specific tradition of magic. A magical item radiates a magic aura infused with its dominant school of magic. Some items or effects are closely tied to a particular tradition of magic. In these cases, the item has the arcane, divine, occult, or primal trait instead of the magical trait. Any of these traits indicate that the item is magical.