In fifth season episode Tracker, a Runner named Kiryk possesses this device, which gives him a temporary advantage over the Wraith hunters pursuing him. The armband, created by an unknown race, allows the wearer to instantly teleport over short distances, with an activation button that glows green when ready to teleport, and red while recharging.
This prop is made of soft flexible greenish-gold silicone rubber, with a disc of LEDs that illuminate red or green by toggling a small hidden switch.
From Propworx.
