The Epson MFN: C31CJ57012 refers to the Epson TM-m30II receipt printer.
 
Here's a quick specification summary:
Print Technology: Thermal line printing
Print Speed: Up to 250 mm/sec
Print Resolution: 203 dpi
Connectivity Options: USB, Ethernet, Bluetooth (model dependent), and optional wireless connectivity
Paper Size: 80mm (standard width) or 58mm with a paper spacer
Compatibility: Supports ESC/POS command system
Operating Systems: Compatible with iOS, Android, and Windows
Compact Design: Ideal for small spaces and point-of-sale systems
Reliability: Rated at 17 million lines MCBF and 150 km of printed paper