2255
From Sensoray Technical Wiki
Model 2255 captures uncompressed frames from four NTSC or PAL video sources and sends them over USB 2.0 to a host computer. Frames are captured simultaneously from all channels.
Model 2257 is functionally identical to the 2255 except for input types: Model 2255 has four composite video inputs whereas Model 2257 has two S-Video and two composite inputs.