The Vitaport-4 series of ambulatory recorders include superior recording quality and provide ergonomic relief for patients during their EEG or PSG recordings. It is user-friendly and flexible, and its modular recording system with input modules designed for EEG and PSG recordings offer optimal comfort to the patient. Its superior signal quality records in EDF format on high capacity Compact Flash cards. The internal rechargeable battery enables 24 hours or more of recording and 48 to 72 hours with the optional external battery pack The Deltamed Coherence software is optimized for review of Vitaport-4 EDF data, providing automatic calibration, montages and DSA trend graphs. The standard hardware and analysis methods are in compliance with the International AASM guidelines.