Armband of Planer Telepathy

allows telepathic communication between different plains of existence 

Enchanted armband that allow telepathic communication between the holder and those holding it's networked counterparts. Capable of broadcasting a telepathic message to those who hold the other networked armbands that are within 500 feet. If a holder is beyond 500 feet they will not be able to receive messages. If a holder is more than 5 feet from their armband they will not receive messages. Susceptible to telepathic eavesdropping with an

INT check of 17 by creatures capable of the Telepathy spell. Uses a bonus action during combat to focus and utilize the armband.