Bluetooth low energy (Bluetooth LE, BLE, Bluetooth Smart) is a wireless personal area network technology designed and marketed by the Bluetooth Special Interest Group (SIG) aiming at novel applications in the healthcare, fitness, digital advertising, security, and home entertainment industries. Compared to Classic Bluetooth, BLE is intended to provide considerably reduced power consumption and cost while maintaining a similar communication range.
The Bluetooth SIG predicts that by 2018 more than 90 percent of Bluetooth-enabled smartphones will support Bluetooth Smart. Most of the latest technological product ranges natively support BLE: mobile operating systems including iOS, Android, Windows Phone and BlackBerry, as well as OS X, Linux, and Windows 8. In 2011, iPhone 4S was the first smartphone to implement the Bluetooth 4.01.
Bluetooth Smart is not backward-compatible with the previous (often called “Classic”) Bluetooth protocol. Bluetooth Smart uses the same 2.4 GHz radio frequencies as Classic Bluetooth.
BLE – Bluetooth Smart was officially introduced on a large scale in 2011. Bluetooth Special Interest Group (SIG) announced the Bluetooth Smart logo so as to clarify compatibility between the new low energy devices and other Bluetooth devices.
New technological products using BLE:
 The iPhone 4S Is the First Bluetooth 4.0 Phone http://www.pcmag.com/article2/0,2817,2395178,00.asp