3PCS Large Replacement Wristband for Fitbit Flex Metal Clasp Included Black Navy Slate Color

Track steps & speed & time & distance
Calculating Calories and fat burned
Monitor sleep quality and performance

No extra fuss
Position control
Gravity compensation

Track Sleep
Wireless syncing
Track Activity

Pedometer : Can whenever and wherever possible to step,View the current training situation and remaining unfinished step number.
Sleep Monitoring: Intelligent monitoring to sleep at night, Up in the morning can see sleep last night, There will be five diagram,Said sleep is very poor , Said poor sleep, said sleep usually , Said sleep good , According to sleep very well.
Bluetooth: smart wristband via Bluetooth to sync to APP, Energy consumption, sleep data at a glance.