Single scale per Beehive, placed in the vicinity of the houseUsing an app that can be downloaded to the cell phone by approaching the scale, the data is downloaded to the mobile phoneSingle scale (metal bar) is placed under one side of the Beehive, on the other side an equal thickness is placedThe scale can communicate to a smartphone the weight it is measuring by approaching the phone (via Bluetooth)Each scale communicates the weight at least twice a day (usually evening and early morning) and in the app it shows the graph of the weight trendPowered by 2 AAA AA batteries lasting 5 years