This is a Flippezero based on open-source documentation, with some modifications and optimizations. The iButton and high-frequency radio have been removed (only the 315 and 433 antennas remain). It can now use any external SMA-interface antenna.

I designed a 3D casing myself and used PLA or PETG materials for 3D printing, meaning it may be somewhat fragile and susceptible to high temperatures.

Please read the following notes carefully:

1. I'm not particularly proficient in RF, so when testing with a 7cm 433 antenna (in a sunny, open area), the receiving distance for both the 315 and 433 antennas was at least 250 meters, and the transmitting distance for the 433 antenna was also at least 250 meters, but the transmitting distance for the 315 antenna was only 120 meters.

2. Due to a bug, the GPIO output 5V now always outputs 5V instead of being software-controlled. However, don't worry, this doesn't affect power consumption.

3. It uses a 7.4Wh lithium battery with a standby current of around 3mA (calculated to provide approximately one month of battery life) and a shutdown current of around 25uA.

I retained as many other functions as possible, including NFC/RFID/Infrared/GPIO/U2F. I also tested Bluetooth/indicator lights/power management.

I also printed casings in other colors. The white one actually uses a transparent PETG material, but the effect isn't particularly good.

I've uploaded some test videos to Bilibili; you can watch them if you're interested.