Yantar-4K2M (Russian: Янтарь meaning amber), also known as Kobalt-M, was a type of Russian reconnaissance satellite and the last operational member of the Yantar series of satellites.
In common with most Yantar satellites, the Kobalt-M used film rather than digital cameras.
This film could not be sent to Earth as easily as digital data.
The Kobalt-M was an improved version of the Kobalt satellite and the first one was launched as Kosmos 2410 in 2004.
The first two landed in film return canisters (called SpK - Spuskayemaya Kapsula) and a final set of film returned in the satellite's special equipment module.