A beautiful balance but mandatory Bluetooth connection!

I am the user manual, download the app for Beurer other functions that this scale offers.
My mobile: Acer Liquid Jade S (Android 4.4.4) => Application gives me access to a page pairing, I check the balance BF700 (this is very random because once out of 10 only app offers the BF700 ) and nothing, no ability to validate via the application or message that we are too far away or that the batteries are exhausted (phone S4 and S5 placed on the balance and new batteries 2 different brands !!!

So I can use this connected scale as it should be.

This balance could be useful with the information it provides, however, it is based on "base" and gives only the weight. I confess to being disappointed and I think'll return it !!!