QardioCore
TECH SPECS 
Size185 x 87 x 9 mm
ChargingYes
BatteryLithium-ion polymer battery.
Battery lifeup to 24 hours.
Water resistanceIP65 (splash and water resistant)
Weight130 grams (including batteries)
SensorAccelerometer, Galvanic Skin Sensor, Thermometer, ECG/EKG sensors.
ConnectivityBluetooth
Internal storage
METRICS 
Heart rateYes, including heart rate variability
Heart rate variabilityYes
Running metricsBasic activity tracking.
Swim statisticsNo
OtherAlso measures EKG/ECG, skin temperature and respiratory rate.
QardioCore continuously records ECG on a single channel with a frequency response of 0.05 to 40hz. QardioCore's A/D sampling rate is 600 samples per second with a 16 bit sampling resolution.
LINKS 
Affiliate link*Amazon | Qardio
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