Black wireless Samsung Level U2 earphones. Pic attached to show how it looks. May have dropped/left it in:
Blue Atrium basement
Room 190 on the first floor
Staircase leading from basement to first floor
Corridors leading from Room 190 to the entrance closest to Huang building
Somewhere outside Y2E2 (close to the building, on the way from the entrances to the X shuttle stop on Via Ortega)

Please message me if you find it.