After a quick charge the device is powered on and ready for sync with your smartphone, either iOS or Android phone is supported. Your device needs to support lower power Bluetooth (Bluetooth LE) which is iPhone 5 and up, or Android phone with 4.3 (and up) with Bluetooth 4.0 spec. The compatibility list is thus quite large. 

Setup is very straight forward, the different steps on both platform are very similar, Razer's software team made sure to have as much consistency across multiple platforms as possible.

iOS initial setup screens

Android inital setup screens

Once the sync is setup the Razer Nabu app will check firmware version check (and update if required)

After the update you are asked to set the goals you which to achieve each day in regards to steps taken, distance walked, calories burned and active minutes

a healthy goal is 10.000 steps per day, the other metrics are less important

The configuration screens of the Nabu are quite straight forward, the most important ones depicted below. What type of notifications are sent to the device from your phone is managed by the smartphone OS. You can set vibration strength and scroll speed and how to dismiss the received messages (button or shake). Under Display settings you set clock style, screen time-out and screen brightness, as well wrist placement which dictates how the screen display is orientated. Last but not least the selling point of the Razer Nabu is found under Social Settings tab where you can enable the Handshake and Pulse function that automatically adds friends/contacts on Twitter / Facebook if you physically shake hands with another person wearing a Razer Nabu.

The battery charge state information is shown on iOS natively on the notification screen, on Android you have to open the Nabu app to check this. On the other hand you do get a nice Home Widget on Android that you can put on your home screen that shows step count without having to open the App, something which iOS lacks.