Sanctuary, Akhkharu Cloak Bracelet

original movie prop

In a third season arc, Helen Magnus and team work to find the location of the fantastic hidden city shown in a holographic map left by her father.  However, the map takes extreme exception to manipulation by anyone with Akhkharu genetic background, which both Magnus and Tesla are tainted with from their experiments with ancient vampire source blood. In preparation for their eventual discovery of the city's location, Tesla designs a bracelet that will hopefully mask their genetic information from any automated defenses.  Magnus activates the bracelet on discovery of the city's secret entrance in episode The Hollow Men, and as she successfully passes through the gateway, it seems to work... sort of. 

Ornate metal bracelet, with concealed circuit board on the inner surface bearing 8 blue microLEDs, reflecting light around the inside of the band.

From Legends Memorabilia.