| Number of pins | 24 |
| Columns | 80 (10cpi); 160 (maximum in compression mode) |
| Graphics resolution | Up to 360 x 360dpi |
| Print speed | Fastest Print Speed: 390cps; Utility: 312cps (12cpi), 260cps (10cpi); Letter Quality: 104cps (12cpi), 87cps (10cpi) |
| Optional interfaces | Serial RS 232C, OKILAN 7120e3 Network Card |
| Emulations | Epson LQ ESC/P2, IBM PPR, IBM AGM |
| Typeface & font | Utility, Courier (scalable), Roman (scalable), Swiss (scalable), Swiss Bold, Prestige, Gothic, Orator, Barcodes, OCR-A, OCR-B |
| Continuous paper | 76.2 - 254mm; ML391T Plus: 76.2 - 406.4mm |
| Continuous envelopes | 165 x 92mm |
| First printable line (from top of page) | Continuous (multi-parts): 0.5mm; Cut sheet (single sheet): 0.5mm |
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