Specifications

Sizing

size small
fits wrists
5.5” - 6.5”
.83”
size large
fits wrists
6.5” - 7.7”
.83”
size x-large*
fits wrists
7.7” - 8.9”
.83”

 

Sizing varies across trackers. Use to pick the right fit & size up if you're between sizes.

* X-large size only available online at Fitbit.com

Sensors & Components

  • 3-axis accelerometer
  • Altimeter
  • Vibration motor

Display

  • OLED

What’s Included

  • Charging cable
  • Wireless sync dongle

Water Resistance

Charge has been tested up to 1 ATM meaning it is sweat, rain and splash proof. However, the device is not swim proof. We also recommend taking Charge off before showering because, as with any wearable device, it’s best for your skin if the band stays dry and clean.

Care

If the band gets wet or if you sweat in it, remove and completely dry the band before putting it back on. Clean the band with a mild soap-free cleanser like Cetaphil or Aquanil. Give your wrist a rest by taking the band off every now and then. 

Materials

Charge's wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. Charge also has a surgical-grade stainless steel clasp.

Batteries & Power

We recommend charging your device every few days to ensure you are always tracking.

  • Battery life: up to 7 - 10 days
  • Battery type: Lithium-polymer
  • Charge time: One to two hours
  • Radio transceiver: Bluetooth low energy

Environmental Requirements

  • Operating temperature: -4° to 113° F
  • Maximum operating altitute: 30,000 feet

Memory

  • Tracks 7 days of detailed motion data – minute by minute.
  • Tracks daily totals for past 30 days

Syncing

Charge syncs automatically and wirelessly to tablets, computers and 150+ leading iOS, Android and Windows smartphones using Bluetooth 4.0 wireless technology.

  • Syncing range: 20 feet
  • Call notifications via Bluetooth 4.0
  • Syncing to computers requires Internet connection and USB port
  • Syncing to mobile devices requires Bluetooth and Internet connection
  • Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices