Flipper Zero is a portable multi-tool designed for cybersecurity testing and hardware interaction. It runs on an STM32WB55 microcontroller (ARM Cortex-M4 + M0) with 256 KB RAM and 1 MB flash, using a lightweight FreeRTOS operating system. The device features a 1.4-inch monochrome LCD display (128×64 resolution) with a simple button-based interface. It supports multiple communication technologies, including Sub-1 GHz radio (300–928 MHz), NFC (13.56 MHz), 125 kHz RFID, infrared (IR), Bluetooth Low Energy, and USB-C, along with GPIO pins for hardware interfacing and debugging. It includes microSD storage (up to 256 GB) and is powered by a 2000 mAh battery. Flipper Zero can read, emulate, and analyze signals such as RFID cards, NFC tags, IR remotes, and radio controls, making it useful for learning and ethical penetration testing, though it has limitations with modern secure systems.