I have no instruction book

You can find a free PDF copy of the owner's manual for the Sansa C200 series MP3 players on the Sansa site at the following address:

http://www.sansa.com/sites/default/files/downloads/c200-ug-eng.pdf

There is no specific manual for the C250 itself since each series has basically the same function as other models within that series. The varying model numbers is merely to differentiate the amount of memory that model has.

You mayl have to check to see which version of the C200 you have if you intend to use MicroSD's in it since there are two different versions of the C200. Version 1 only supports MicroSD memory while Version 2 supports MicroSDHC. You can tell which Version you have by checking the first two digits of the firmware level. Version 1 has a firmware level starting with 01 (probably 010100p for US and Asia-Pacific models, 010100e for Europe without FM support and 010100f for Europe with FM support). Version 2 has one starting with 03 (probably 030205a for most current USA firmware with e for non-FM Europe and f for FM Europe).

Hope this helps you.

i cannot save any songs on c250