tested at a friend so being purchased against by, in general, these products use the Bluetooth Low Emission connection (BLE) in implanted version 4.0 physically on a number of smartphones (special chip) but not all Except those equipped with the chip does not know all to use So you have a smartphone Android 4.4 and BLE (kitkat) minimum (my S4 mini market only since the shift in 4.4.2) My Nexus 7 tablet is BLE but will never have the version 4.4: it will never work unless the machine rooter
For iphones, some mismanage the BLE (5S but it's fixed, I think), others do not have this standard: it works from 4 4S but can not work (not good chip)