This app has a few sensors incorporated to enable it give somewhat precise information about the direction of obstacles.
The performance level is solely dependent on the device, some device will have a better performance than others. It depends on which product is the device.
For an optimized use of this app, it is advisable to turn on the device GPS.
Tips: when you open this app, your device will vibrate for a few milliseconds, during this time, the device picks up signals around it and analyses them. It then warns you if there are objects less than 1.2 meters around. So just allow it do the job :)
A more precise distance from obstacles up 1.2 meters. A vibration effect as obstacles are detected. Warns you once the distance from the obstacle is less than 1.2 meters.