Bluetooth Low Energy (Bluetooth LE, or BLE) is a Bluetooth radio technology designed for low power consumption. It is commonly used by sensors, wearables, trackers, and other devices that send small amounts of data. Its range depends on hardware, antennas, radio settings, and the environment; it is not inherently limited to a particular distance.
In cyber security, Bluetooth LE matters because devices may advertise their presence and exchange data over wireless links. Detecting an advertisement or establishing radio contact does not by itself grant trusted access: pairing, authentication, and application-level authorization determine what a connection can do. Real attacks may target weak pairing or insecure device services, while defenses include keeping firmware updated, limiting discoverability, reviewing paired devices, and enforcing strong access controls. Bluetooth LE also offers options such as Coded PHY that can improve robustness and range at lower data rates, but greater range does not replace security controls.