Bluetooth 4.0 is a version of the Bluetooth wireless networking standard that consumes less power than its predecessors.
Bluetooth 4.0 allows small devices with lengthy battery needs, such as personal fitness trackers and patient health monitors, to communicate with smartphones, tablets and PCs. This advancement in compatibility has opened the door to more widespread use of these devices, which previously relied on custom-built low-power networking technologies.
Bluetooth 4.0, which the SIG ratified in 2010, also includes the Classic Bluetooth and Bluetooth High Speed protocols. In 2011, Apple's iPhone 4S became the first Bluetooth 4.0 phone to hit the market. Nokia developed a low-power version of Bluetooth during the first decade of the 21st century. In 2007, the Bluetooth Special Interest Group (SIG) came to an agreement with Nokia to include the technology, then called Wibree, in future versions of the standard. The protocol is now called Bluetooth Low Energy.