Functional: Channels: 3 or 8 Channel Digital Recording Resolution: 8, 10, 12, or 16 Bit Sampling Recording: Full Disclosure, No Data Compression Data Transfer: USB Cable or Flash Card Reader Sample Rate: 128-1024 Samples Per Second Frequency Response: 0.05Hz to 60Hz @ -3db ECG Signal Verification: LCD at Hook-up or on Demand Pacemaker Detection: 2.0mv~200mv 0.1ms~2.0ms. Memory: Recording Time: 24H, 48H, 72H, 96H and 7 days Type: Nonvolatile, SD Card Capacity: Up to 2048 MB (Removable). Physical: Dimensions: 2.682.080.63 (68mm,53mm,16mm) Weight: 1.48oz (42 grams excluding battery) Enclosure: Molded Plastic / Water Resistant Operating Position: Belt Clip, Lanyard. Plastic case.