The E4 is easy to wear and adjust. Follow the steps below to ensure a proper fit and obtain the highest quality signals.
- Slide the loop towards the case and place the E4 wristband top-down on a surface.
- Wear the E4 wristband on the non-dominant hand with the case on the top of the wrist. The EDA electrodes (under the snap-fastener) should line up on the bottom of the wrist. Line them up under the middle and ring fingers.
- Wrap the band over snaps and tighten. To secure, connect one snap at a time. If too tight, loosen by one snap. Tighten the E4 wristband band enough to ensure the EDA electrodes do not change position on the skin during normal movement but not so much as to constrict blood flow or cause discomfort. Adjust the band by sliding up the wrist towards the elbow until it is snug. Reposition the band if it becomes loose during use.
- The E4 wristband should fit snugly above the wrist joint. When the E4 wristband is properly secured, you should not be able to see any light escaping from the PPG sensor on the back of the wrist under the E4 wristband without lifting the housing from the wrist.
Press the button for 2 seconds to power on the E4 wristband.
 Traditional recommendations are to record EDA on the nondominant side to minimize motion artifacts (e.g. a right-hander would wear it on their left wrist). However, recent studies show that the dominant side may have a much stronger EDA signal during certain kinds of stress. Also, neurological events (such as seizures) may elicit EDA on only one side. (For more information see: Picard, R. W., Fedor, S., & Ayzenberg Y., “Multiple Arousal Theory and Daily Life Electrodermal Activity Asymmetry” Emotion Review, March 2015.). Depending on your purposes, you may want to measure on the right, left, or both wrists.
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