Hi @ShivaRagu ,
Did you installed the last firmware on the board (the smartphone and). You have then to enable the Bluetooth and the localization service on your smartphone.
You are then able to upload the Baby crying app, that has a dedicated "homepage" and should activate the green LED on the board when a baby cry is detected.
If you have done all these steps without success, I suggest you to try with the attached bin firmware version and upload it on the sensortile.box board as described in this post.
Please let me know in case of any progress.
-Eleon