Nox A1s polysomnography device hospital and home diagnostics | ResMed

Nox A1s™

Portable and easy-to-use polysomnography system

Like its predecessor, the Nox A1s is an easy-to-use1, portable polysomnography (PSG) system that enables home-based or in-lab diagnosis of sleep-related breathing disorders. With an ergonomic design, the device has been developed to record a high-quality signal.

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Nox A1s offers

Discover the Noxturnal App

The Noxturnal app is a smart Android™ app that can be used on your mobile phone or tablet to help simplify the setup of your sleep studies. Connected wirelessly to the Nox A1s Recorder, it offers a variety of advanced functionalities designed for a more flexible user experience:

  • a control status and live signals,
  • the possibility to configure and start recording remotely,
  • the ability to perform biocalibration and impedance checks next to your patient.

Nox A1s and Nox SAS FAQs

The Nox SAS uses comparable physiological signals to those used in a traditional PSG5,6,7, with these additional enhancements:

  • Forehead electrodes for avoiding EEG placement on scalp or chin
  • Simplified setup for home PSG studies
  • Four ECG electrodes

Nox A1s is compatible with Nox SAS, so you only need to purchase the following to enjoy the Nox SAS experience:

  • 70710079 – Nox SAS Head Cable, CE
  • 70710078 – Nox SAS Body Cable, CE (Left)
  • 70710077 – Nox SAS Body Cable, CE (Right)
  • 70710076 – Nox SAS Electrode Pack (20 pcs)
  • 70710075 – Nox SAS Neck Band (20 pcs)
  • 70710074 – Nox SAS Disposable Carton (20 pcs)

The Nox A1s can record the following signals:

  • Thorax and abdomen RIP
  • Nasal pressure/mask pressure
  • Snore and audio channels
  • 13 unipolar channels
  • 4 bipolar channels (PLM, EKG, EMG, EEG or other)
  • Position and activity,
  • Light
  • SpO2, pulse, and plethysmography

The Nox A1s with Nox SAS setup can record the following signals:

  • Thorax and abdomen RIP
  • Nasal pressure/mask pressure
  • Snore and audio channels
  • 8 unipolar channels
  • 6 bipolar channels
  • Position and activity
  • Light
  • SpO2, pulse, and plethysmography

Warranty & services

Looking for service and warranty information on Nox A1s and Nox SAS?
Find the answers to your questions in our resource centre.


Please refer to the user guides for relevant information related to any contraindications, warnings and precautions to be considered before and during use of the product. This content is intended for health professionals only.


  1. Yoon, IH Hong, I Baik, HW Shin. Evaluation of the feasibility and preference of Nox-A1 type 2 ambulatory device for unattended home sleep test: a randomized crossover study. Sleep and Biological Rhythms, 2019
  2. Montazeri, K., Ægir Jónsson, S., Skírnir Ágústsson, J., Serwatko, M., Gislason, T., Arnardottir, E. “The design of RIP belts impacts the reliability and quality of the measured respiratory signals”. Sleep Breath. 2021 Jan 7.
  3. Punjabi NM, Brown T, Aurora RN, et al. Methods for home-based self-applied polysomnography: the Multicenter AIDS Cohort Study. Sleep Adv. 2022;3(1): zpac011. doi:10.1093/sleepadvances/zpac011
  4. Nox Medical. Clinical Validation – Nox SAS Sleep Stages and Arousal Scoring Report. 2023.
  5. Punjabi NM, Kaplan PW, Margolick J, Aurora RN. 0319 A Simplified Bipolar Frontal Montage for Recording and Staging Sleep. Sleep. 2018;41:A122-A122. doi:10.1093/sleep/zsy061.318
  6. Kainulainen S, Korkalainen H, Sigurðardóttir S, et al. Comparison of EEG Signal Characteristics Between Polysomnography and Self Applied Somnography Setup in a Pediatric Cohort. IEEE Access. 2021; 9:110916-110926. doi:10.1109/ACCESS.2021.3099987
  7. Rusanen M, Korkalainen H, Gretarsdottir H, et al. Self-applied somnography: technical feasibility of electroencephalography and electro-oculography signal characteristics in sleep staging of suspected sleep-disordered adults. J Sleep Res. 2023;e13977. doi:10.1111/jsr.13977

Content last updated: 04/2024