Pendant of Larris is an amulet shaped key check Mini-drone.
For ten thousand years ago using Ancients jewelery when they were doing their research with Mini-drone technology. They abandoned research on the planet, and the key was probably left on the planet when they abandoned it. Thousands of years later found that one of the Harmony's ancestors who used it and brought it to the next generation until it was inherited by Harmony for when she would be the next queen.
In 2008, as used Princess Harmony key when she would meditate at Ruins of Larris which were the ruins of the outpost . When she first tried it so it glowed because of two Genii had changed with the crystals in the panel. Dr. Rodney McKay might change back in control again but did not try when several Genii appeared. Lt. Colonel John Sheppard took the risk and took the key from the Harmony and the key glowed and he got off several mini-drones. Harmony took the key from him and put her hand on the panel and the key glowed as she showed was worthy of becoming queen. (SGA: "Harmony")