The E4 and Embrace serve two different purposes. The Embrace is optimized to detect unusual movement patterns and changes in physiological signals that could be associated with convulsive seizures, and with the Alert App it notifies caregivers to speed up assistance. In some situations, it can also be used for large research studies on a subscription basis.

Instead, the E4 is a device intended for researchers, so that they can record physiological signals in real-time and do after-the-fact analysis.

USE:

In addition to alerting for unusual movement and changes in physiological signals, Embrace can also monitor rest, sleep and physical activity.

The E4 wristband on the other hand, is designed for research on physiology in daily life and is not meant for consumer use. It is flexible with tools for data recording and management as well as real-time streaming using its companion app on iOS and Android.

E4 data are also accessible in real-time via our mobile APIs for iOS and Android to allow for integration with existing protocols using mobile data collection. For sample projects visit https://developer.empatica.com.

Please bear in mind that the software for each device is unique and designed for different types of users so they are not compatible or interchangeable. E4 software does not work with Embrace and vice versa.

	EMBRACE	E4 WRISTBAND
USAGE	Epilepsy Monitor Sleep and Rest Management Physical Activity tracking	Lab and Home Recording Real-time Clinical Observation Raw data Analysis Real-time Data in your App
SENSORS	EDA (GSR) 3-Axis Gyroscope 3-Axis Accelerometer Thermometer	EDA (GSR) PPG 3-Axis Accelerometer Infrared Thermopile
FEATURES	Water Resistant Analog-like Watch Interchangeable Band	Splash Resistant Event Marker 60+ Hours Flash Memory
DATA TRANSFER	Bluetooth Smart	Bluetooth Smart USB 2.0
BATTERY LIFE	24 to 30 hours (original Embrace) 48+ hours (Embrace2)	20+ Hours Streaming Mode 36+ Hours Memory Mode
FORM FACTOR	Case: 37x30x10 mm Wrist: 100 - 210 mm Weight: 17g	Case: 44x40x16 mm Wrist: 110 - 190 mm Weight: 25g
INTEGRATIONS	None	iOS and Android SDK Windows TCP Server
PRICE	249.00$ Research software and pricing available on request	1,690.00$ Volume and Academic discounts available