The Canon CR-120/CR-150 Main Unit is the core scanning body for Canon's CR-series check/document scanners, machines built specifically for high-speed reading of bank cheques and similar financial documents (MICR line reading, endorsement printing and image capture) rather than general office document scanning. Being sold as a "Main Unit" suggests this is the base scanning mechanism, potentially separate from optional feeders, endorsers or other accessory modules Canon offers for this line. This is a specialised piece of banking/retail back-office equipment rather than a general-purpose scanner, and exact throughput, resolution and interface details aren't given in this listing — worth confirming against Canon's datasheet for the exact CR-120 or CR-150 model before deployment.