The Autocorr® Pulse Oximeter with SAC (Serial Autocorrelation) Technology uses refined hardware and unique patented software to determine SpO2, pulse strength, and pulse rate data in a new way. This cost-effective, compact monitor incorporates clinical, home and sleep study functions as standard features, and a data log or trend printout of stored information is available when used in conjunction with a printer or computer. Product Features: Digital Serial Autocorrelation (SAC) Technology. Optional Analog Output. Optional Nurse Call. Large LED display. Product Benefits: Improved performance with challenging clinical subjects. Versatility. No extra cost. Improved patient care, safety. Use in any environment. Autocorr® Transportable Pulse Oximeter System SI3304 Autocorr® Transportable Pulse Oximeter System SI3304LS Autocorr® Digital Pulse Oximeter, Loud Speaker SI3304MDD Autocorr® Digital Pulse Oximeter, MDD version