wristbands (both small & large)
What’s included in special edition Charge 4
reflective band (both small & large)
wristband (both small & large)
Sensors & Components
heart rate monitor
Battery & Power
Battery life up to 7 days, or up to 5 hours with continuous
GPS use. Battery life and charge cycles vary with use, settings, and other
factors; actual results will vary. We recommend charging every few days to
ensure you’re always tracking.
time (0-100%): Two hours
transceiver: Bluetooth 4.0
7 days of detailed motion and heart rate data, minute by minute
daily totals for past 30 days
heart rate data at 1-second intervals during exercise tracking and at
5-second intervals all other times
Water resistant to 50 meters. After swimming or getting the
band wet, we recommend drying the band because, as with any wearable device,
it's best for your skin if the band is clean and dry. We do not recommend
wearing Fitbit Charge 4™ in a hot tub or sauna. Learn more.
Give your wrist a rest by taking the band off every now and
then. If the band gets wet or you sweat in it, remove and completely dry the
band before putting it back on. Learn more.
This tracker includes a plastic resin case and the band
includes a stainless steel buckle. The classic band is made of a flexible,
durable material similar to that used in many sports watches. The woven band is
made from a comfortable polyester.
Like all heart rate tracking technologies, accuracy is
affected by physiology, location of device and different movements.
temperature: -4° to 140° F
temperature: -20° to 60° C
operating altitude: 28,000 feet
operating altitude: 8,535 m
Syncs automatically and wirelessly to most popular phones
and tablets using Bluetooth LE wireless technology.
range: Up to 30 feet
features like smartphone notifications may require Android 7.0+. Check your
to mobile devices requires Bluetooth LE and internet connection.
with Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later,
Android 7.0 and later.
control via Bluetooth LE on Android and iOS devices.
Print this guide to find the right size for you. Both small
and large sizes included in box.
wrist 5.5" - 7.1" in circumference
wrist 140 mm - 180 mm in circumference
wrist 7.1" - 8.7" in circumference
wrist 180 mm - 220 mm in circumference
l x 0.9in w x 0.5in h
l x 22.7mm w x 12.5mm h