When the Jiobit is connected to your phone via Bluetooth for the first time, you’ll immediately see the Proximity Bar in the Jiobit App. This is the slider at the bottom of the app that typically shows your photo and the wearer's photo.
The sliding proximity bar estimates the distance between you (your phone) and the Jiobit. As this distance decreases, the “slider” will get smaller, or the photos will get closer together. As the distance increases, the “slider” will get further apart. You must be connected via Bluetooth in order to see the Proximity Bar.