An electric eraser with 8 refill erasers it runs on 2 AAA batteries made by derwent
Derwent Battery Operated Eraser
Derwent Battery Operated Eraser - Erasors - Ponto das Artes
DERWENT BATTERY OPERATED ERASER
Tools On My Desk: Best Erasers for Colored Pencil — Vanilla Arts Co.
Derwent Battery Eraser - The Deckle Edge
Derwent Battery Operated Artists Eraser
Derwent Battery Operated Eraser Artist Tool, Drawing, Art Supplies
DERWENT Electric Battery-Operated Eraser (with 8 erasers) + 30
Derwent® Battery Eraser