Conventional Bluetooth is suitable to process, transfer and exchange a large amount of data on a non-stop basis (example in audio). However, it consumes a lot more power and is much more expensive.
The BLE technology , on the other hand, is suitable for applications that do not require the transfer of large amounts of data , and may therefore recover only a few information (such as time or temperature, for instance) . As a result, the device may run on battery for several years at a lower cost than Bluetooth, as it does not require a continuous connection .