The Sprinter (also called ZX-Sprinter) is a microcomputer made by Russian Peters Plus, Ltd.; it is the last model of ZX Spectrum being produced in a factory. It's built using what the company calls a "Flex architecture". This uses an Altera PLD as part of the core logic, allowing the machine's hardware to be reconfigured on the fly for several ZX-Spectrum models' compatibility or its own enhanced native mode (hardly used). This is comparable to the design of Jeri Ellsworth's C-One reprogrammable computer.
The Sprinter in one of its modes runs the Estex operating system but mainly it works in many modes of the Sinclair ZX Spectrum home computer of the 1980s (with TR-DOS Spectrum system on-board).