 SCP-126 is an invisible and intangible entity that can only be identified via sound. SCP-126 is sentient, with the ability to speak in multiple languages in a female voice. To date, no method by which SCP-126 can be visually detected has been devised, as SCP-126 does not appear to emit any kind of light, radiation, heat, or electromagnetic energy. SCP-126 does appear to occupy an area, as evidenced by the ability to triangulate its suggested location via its voice. SCP-126 also emits sound when moving, consistent with footsteps made by a human subject wearing high heels with a mass of approximately 55 to 60 kilograms.