The Datex-Ohmeda 3900 Pulse Oximeter has an easy-to-use interface and intuitive feature set, as well as advanced TruTrak+ technology, a proprietary clinical motion algorithm, which identifies, quantifies and corrects patient motion. The 3900 also offers a unique data analysis feature through TelrOximetry PC Access Software. The 3900 pulse oximeters are submitted to rigorous environmental/ mechanical stress testing such as rough handling and free fall drops, exposure to extreme temperatures and humidity, chemical and cleaning solvent resistance tests.