How I can set up the time and date?

You don’t need to set the date and time. once you bind the device with the app and sync the date and time will update automatically.

The fitness tracker itself does not do timing by itself, it just reads your phone’s time, so if you wish to update time, make sure the phone time is correct and sync again.

How long does the tracker take to charge?

Around 1-2 hours for fully charge and the battery life can be up to 7-10days (Charge cycles vary with use & settings)

Is there any type of charging device in the box ? I can't find charger in the box.

ZURURU fitness tracker does not require a charging cable, just pull open the strap and take out the bracelet body, insert the chip-mounted end of the bracelet body into the USB interface to activate the product by charging.

How does the sleep tracking work?

Just wear the tracker and sleep as usual, Zururu tracks your sleep habits and quality every night.

Sleep tracking is based on your movement. When you haven’t moved for about an hour, your device assumes that you’re asleep. Additional data—such as the length of time your movements are indicative of sleep behavior (such as rolling over, etc.)—help confirm that you’re asleep. Morning movement tells your tracker that you’re awake.

How to get the tracker apart to charge?

Gently pull the bands off the tracker body following the direction of the arrow.

Insert the build-in USB plug with metal pins into a USB charger for charging.

Remove the tracker body from the power supply once fully charged.(Device will automatically boot up once fully charged.)

With which android OS is this compatible?

It is compatible with iOS 7.1 & Android 4.4 above, Bluetooth 4.0.