Hackitsune Dual-Band RF Module for Flipper Zero – 400MHz + 900MHz Sub-GHz Expansion

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The Hackitsune Dual-Band RF Expansion Module for Flipper Zero (400MHz + 900MHz) is a high-performance GPIO add-on designed to significantly extend the Sub-GHz capabilities of the F lipper Zero. This module integrates two dedicated RF transceiver paths covering the ~300–950 MHz spectrum, enabling improved reception sensitivity, stable signal transmission and extended operational range. The dual-module design allows researchers to work across both lower Sub-GHz bands (~300–500 MHz) and higher bands (~800–950 MHz), selectable via an onboard hardware switch. This external module provides a safe interface for extended frequency experimentation, reducing the risk of stressing your flippers onboard components. Technical Requirements Flipper Zero (not included) External antenna (connected before operation) Compatible Sub-GHz firmware (standard or custom - we recommend momentum firmware) 5V GPIO power enabled in Flipper settings (required) Why 5V Power is Required We designed the bord to maximise stability and provide an low noise, filtered power supply with; Stable power delivery for RF transmission bursts Reduced electrical noise improving RF performance Prevention of voltage dips during transmission Using the 3.3V rail may result in SD card instability or corruption due to voltage sag, RF signal degradation and reduced range, and unreliable module behaviour under load. How to Use Attach the module to the Flipper Zero GPIO header. Connect a compatible antenna to the selected RF module. Enable 5V GPIO power in Flipper settings. Select the desired frequency band using the onboard switch. Operate using Sub-GHz applications on the Flipper. Important Usage Notes Always connect an antenna before transmitting (Operating without an antenna can damage RF components) Switch frequency bands only when the device is idle. Use appropriate antennas for the selected frequency band and module. Key Features Dual-band RF expansion (400 MHz + 900 MHz) Extends Flipper coverage across ~300–950 MHz Improved range and signal reception Hardware switch for band selection Designed for stable 5V GPIO operation Disclaimer Devices capable of transmitting radio signals must be used in accordance with local radio spectrum regulations. Ensure appropriate licensing and operate only in authorised testing environments. Hackitsune hardware is designed for professional security research, development, and authorised testing purposes only. Users are responsible for ensuring compliance with all applicable laws and regulations in their jurisdiction. Always obtain proper authorisation before interacting with systems, networks, or devices you do not own. Hackitsune accepts no liability for misuse of this product. Use responsibly. 🦊 Show more