What toner cartridge does the HP LaserJet MFP M140we use?

The M140we uses a single HP 134A Black LaserJet Toner Cartridge — one SKU, no high-yield alternative, no separate drum unit, and no color cartridges to track. It’s a frictionless, single-speed setup perfect for low-volume desks where you just buy the same cartridge again when it runs out.