watch Smartwatch Fitbit Charge unisex

Product: watch Smartwatch Fitbit Charge unisex FB421SRBU

Fitbit unisex smartwatch watch from the charge 5 collection. Smartwatch watch with aluminum, glass and resin case. The strap is made of blue silicone, with an aluminum buckle. Screen size: display area: 26. 43mm diagonal. Screen height: 21. 93mm. Screen width: 14. 75mm. Battery up to 7 days of autonomy. Charging time: 2 hours. Health features: Fitbit ecg app (electrocardiogram), scan eda app (electrodermal activity), stress management score, oxygen saturation monitor (spo2), heart rate variability (hrv), respiratory rate, skin temperature monitor, phases & score of sleep, menstrual cycle monitoring, health and wellness reminder. Fitness functions: daily recovery level, minutes in active zone, continuous heart rate tracking with purepulse, integrated gps, smarttrack®, training intensity map, 20 training modes, cardio activity level, swimming resistant. Smart features: notifications, google fast pair, sleep mode, smart alarm, do not disturb mode, Fitbit pay. Sensors and components: optical heart rate monitor, 3-axis accelerometer, integrated gps + glonass, red and infrared sensors for oxygen saturation (spo2) monitoring, integrated temperature sensor (skin temperature variation available on Fitbit app), a motor vibration, ambient light sensor, radio transmitter: bluetooth, near field communication (nfc), multipurpose electric sensors compatible with ecg app and eda scanning app. The Fitbit app is compatible with apple ios 12. 2 or above, android os 8. 0 or above. Synchronization range: up to 9m. The reference is fb421srbu