| General | |
| Manufacturer: | ONYX |
| Model: | BOOX M91S Odysseus |
| Measurements | |
| Dimensions (mm): (width x height x thickness) |
179.4 x 242.9 x 12.3 |
| Weight (g): | 518 / 732 |
| Display | |
| Display type: | E-Ink Pearl |
| Screen Size: | 9.7 |
| Screen Resolution (px): | 825 x 1200 |
| Grayscale: | 16 |
| Built-in lights: | No |
| Supported formats | |
| Text: | CHM, DJVU, DOC, DOCX, EPUB, FB2, HTML, MOBI, PDB, PDF, PPT, PPTX, RTF, TXT, XLS, XLSX |
| Graphic: | BMP, GIF, JPEG, PNG, TIFF |
| Audio: | MP3 |
| Other: | ZIP |
| Processor | |
| Processor Type: | Marvell PXA166 |
| Clock Frequency (MHz): | 800 |
| Memory | |
| Random access memory (RAM) (MB): | 128 |
| Read-only memory (ROM) (MB): | 2048 |
| Memory Cards: | MMC, SD, SDHC |
| Communications | |
| Multimedia | |
| Speaker: | mono |
| Output of earphones: | 3.5 |
| Charging | |
| Capacity battery (MAh): | 1600 |
| Charging | |
| Charging from USB: | Yes |
| Charging from the mains: | Yes |
| Additionally | |
| Features: | Operating system: Linux Programming language: Month work without recharging |