Description
The Credit Card Sized Multi-Tool.
The KIISU V4BR is one of the most exciting portable development platforms available today. Designed as a credit card-sized alternative to the Flipper Zero, KIISU packs an impressive collection of wireless, contactless and hardware interfaces into a form factor small enough to fit inside your wallet.
Whether you're experimenting with RFID, NFC, Sub-GHz, infrared, Bluetooth or custom GPIO hardware, KIISU provides an incredibly capable development platform while remaining compatible with a large ecosystem of Flipper Zero firmware and accessories.
Unlike many hobbyist development boards, KIISU has been engineered to be genuinely portable, making it ideal for engineers, makers, hardware developers and authorised security researchers who want a compact platform they can carry every day.
Flipper Compatibility
KIISU is designed to run firmware derived from or compatible with much of the Flipper Zero ecosystem and supports many existing Flipper applications and GPIO expansion boards. Because firmware projects evolve independently, application compatibility may vary between releases.
Why We Think KIISU is Special
There are plenty of development boards.
There are plenty of wireless tools.
There are very few devices that combine:
- Wallet-sized portability
- Multiple wireless technologies
- Open firmware
- GPIO expansion
- Excellent community support
- Rechargeable operation
- Modern USB-C connectivity
into one beautifully engineered platform.
KIISU strikes an excellent balance between capability, portability and price.
Firmware
KIISU ships with its own firmware but also supports firmware and applications derived from the wider Flipper ecosystem.
As firmware is actively developed, we always recommend using the latest official releases for the best experience and newest features. Recent updates have addressed stability, AUX MCU configuration and charging behaviour.
Hardware Features
Sub-GHz
- CC1101 Sub-GHz transceiver
- External antenna support
- Compatible with many Sub-GHz applications
NFC
- ST25R3916 NFC reader/emulator
- Integrated antenna
- Read, emulate and experiment with NFC technologies
RFID
- Built-in RFID reader
- RFID emulation capabilities
- Integrated antenna
Infrared
- IR transmitter
- IR receiver
Perfect for experimenting with IR protocols and remote control applications.
Bluetooth
Bluetooth Low Energy (BLE)
GPIO Expansion
Pin-compatible GPIO interface supporting many existing Flipper Zero compatible expansion boards.
iButton
Integrated iButton support.
Package Contents
- KIISU V4BR Development Board
- USB-C connectivity
- Quick Start documentation
(Battery and accessories may vary depending on bundle selected.)
Useful Links
Official Website
Documentation
GitHub
Firmware
https://momentum-fw.dev/update?branch=kiisu-mntm
Notice
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. 🦊
Community Reviews
Hackitsune isn't simply stocking KIISU we're building an ecosystem around it.
Coming Soon from Hackitsune
Custom low-profile GPIO expansion modules designed specifically for the KIISU form factor
While KIISU supports existing Flipper Zero GPIO accessories, the credit card design deserves hardware that is equally compact. Our upcoming expansion boards are being designed specifically for KIISU to minimise overhang while maintaining full compatibility with the GPIO interface.
Examples currently in development include:
- ESP32-c5 WiFi module
- High capacity power module
- External RF antenna mod kit.
Custom Protective Cases
We're also developing a range of: protective cases and every day carry cases designed specifically for KIISU.
