For Sale: MCR Option for SAM4 – ER-900 and SPS-300 series cash registers Fits: ER-940, ER-915, ER-920, ER-945, ER-925, SPS-345, SPS-340, SPS-320 Guaranteed to fit the above registers! Never fear! MCR reader is sold by an authorized CRS dealer. Unit is reconditioned, tested and comes with installation instructions and a 30 day DOA warranty!