BLE 5.1, or Bluetooth Low Energy version 5.1, is a wireless communication protocol designed for low power consumption and efficient data transfer between devices. Introduced in 2019, BLE 5.1 brought significant advancements over previous versions, notably the Direction Finding feature, which enables precise device location tracking using Angle of Arrival (AoA) and Angle of Departure (AoD) methods. This makes BLE 5.1 valuable for applications such as asset tracking, indoor navigation, and proximity-based services. Its enhanced advertising capabilities and improved channel selection further increase reliability and reduce interference, making it suitable for IoT devices, smart home systems, and secure wireless communications. Security features include encryption and authentication to protect data and prevent unauthorized access.