Bluetooth 4.2 version is a power-efficient variant of the classic Bluetooth technology, which is designed for short-range communication between devices. This version was officially adopted in December 2014 and offers several significant improvements over its predecessors. One of the key features of Bluetooth 4.2 is its improved data transfer speed. This version can transfer data 2.5 times faster than previous versions, which significantly enhances the overall user experience. Another notable improvement is its enhanced privacy features. Bluetooth 4.2 introduces a feature that makes it harder for unwanted devices to track a Bluetooth device's signal, unless that device has explicitly allowed for it. Bluetooth 4.2 also offers better power efficiency. This is particularly beneficial for battery-powered devices such as fitness trackers, smartwatches, and other wearable technology. Bluetooth 4.2 also supports Internet Protocol version 6 (IPv6), enabling Bluetooth devices to access the internet directly. This feature, which was not possible in earlier versions, opens up a wide range of possibilities for home automation and IoT applications.