: This paper details a hardware system using an ESP8266 microcontroller and a buzzer to find missing keys via a mobile webpage.

: An app available on Google Play for buying, selling, or renting cars and properties, featuring advanced search filters and instant notifications.

These tools are used to recover lost license keys for Windows, Office, and other installed software.

: A research paper published in the International Journal of MRSET describing a Bluetooth Low Energy (BLE) gadget and mobile app with proximity alarms and real-time monitoring. 3. Musical Key Detection for DJs

: A free utility that retrieves product keys from the system registry. The Win Keyfinder official site released version 2.3.0.0 in October 2023 with enhanced BIOS/UEFI key recovery.

: An open-source option available on the Microsoft Store that can view current and original pre-installed Windows keys. 2. Academic & Technical Papers (IoT)