OKI Data provides a wide range of devices, from printers, faxes and multi-functional products to business applications and consultancy services.

Through its American business arm, OKI Data America markets the OKI proColor Series, a line of digital production printers designed specifically for the graphic arts and production market in North America to offer print solutions for color-critical applications.

In 1877, only a year after Alexander Graham Bell's invention, Kubusho had started an effort to make telephone receivers by reverse engineering and Oki was in the team that came up with the first prototype.

A strong demand emerged for the PBX (Private Branch Exchange), the largest system of which in Japan installed by OKI.

To respond to the high-level economic growth Japan was experiencing, OKI needed to speed up its business operations and clarify responsibilities.

In June 1961, OKI launched OKITYPER-2000, an electric teletypewriter that could simultaneously make perforation tapes and book entry forms.

[citation needed] In 1964 OKI developed OKISAVER, a terminal for online deposits which was provided to financial institutions.

In addition to minicomputers such as the OKITAC series developed in the mid-1960s, OKI began supplying various I/O devices, electroprinters, and dot printers, mainly to the financial industry in the 1970s.

OKI's business at this time included cash dispensers (CDs), automatic depositors (ADs) and automated teller machines (ATMs).

Notably, in 2012, OKI delivered its ATM-Recycler G7 cash-recycling ATMs to Alfa-Bank, Russia's largest private bank, marking the first installation of Japanese-made cash recyclers in the country.

[14] Oki data produced printer will continue to be sold in the United States under their distribution partners brand, IntoPrint.

From 2003 to 2008, Oki owned the naming rights to Jubilee Oval in Kogarah, Sydney, Australia, which was the home ground of National Rugby League team St George Illawarra Dragons.