This content is for the Kenek Edge pulse oximeter.

Intended Use

The Kenek Edge pulse oximeter by LionsGate Technologies (LGThealth) is an iOS app (available from Apple App Store) and audio-port finger sensor (available from Amazon) for spot-checking blood oxygen saturation (SpO2) and heart rate.  The device should only be used while the user is not moving and not engaging in vigorous activity. 

The Kenek Edge pulse oximeter is not a medical device and is not intended or available for sale for medical or clinical use by physicians or patients.

Extended Recording

The Kenek Edge pulse oximeter can record measurements of SpO2 (blood oxygen saturation) and pulse rate.  See this article for details on how record measures, change the period of recording, and to export data.


In order to record for extended periods, several considerations are important.

  • Battery life
  • Background mode (turn off screen)
  • Finger position
  • Mobile device position

Battery Life

The mobile device screen consumes significant percentage of battery life.  Turn off the screen after you start it recording for an extended period.  Ensure that the mobile device is fully charged before beginning the session.  

To further extend the operating life of your mobile device, you may connect it to an external recharging battery - you should NEVER connect it to a wall-charger or other charging means that use the electrical plugs or "mains".  For Apple iPhone 7, 7+, 8, 8+ and X that do not have separate audio port and charging port - a Lightning port splitter and Apple's Lighting Port Adaptor (Lightning-to-audio) is required to charge from an external battery while using - see this article on the use of Lightning Port Adaptor.

Background Mode

To start, Kenek Edge must be foreground mode (the screen lit up).  The interface is visible on the screen and the pulse waveform is moving - you can start recording once numbers appear.

Depending on your configuration, your mobile device may automatically turns itself off.  Alternately, you can click the start button to turn off the screen.  It will continue recording.

Finger Position

It is necessary to keep the finger properly positioned in the finger clip at all times.  The finger can become poorly positioned in the finger clip and the signal quality may degrade.  Once the signal degrades too much, the Kenek Edge app may stop recording.  You should be careful to limit movement as much as possible to avoid noise artifacts in the signal.

For extended recordings, it may be desirable to affix the finger probe using skin-safe adhesive tape (for example, medical tape).  It may be helpful to tape or constrain the cable of the finger probe to avoid dislodging it.

Mobile Device Position

Since the finger probe is connected to the mobile device, one may pull on the other during any unintended movement.  The finger may be dislodged from the probe.  Or the mobile device may fall or become disconnected from the probe.  It is important to secure the mobile device properly so that correct operation can be maintained for the entire period of the recording.

One method of securing smartphones is to use an upper arm band or forearm band designed for carry of smartphones.  These are commonly available and often used by joggers or cyclists to listen to music while training.  They can be used to hold a smartphone (but not a tablet) on the arm being measured and limit undesirable movement between the finger probe and device.