PNJ Fly is a free Android application developed by SteveChan, designed to control 4-axis aircraft through Wi-Fi. The app provides a real-time video feed from the aircraft, allowing users to take photos and save videos. With PNJ Fly, you can easily control your aircraft from your Android smartphone.

The app is easy to use, with intuitive controls that allow you to fly your aircraft with ease. Whether you're a beginner or an experienced pilot, PNJ Fly is a great tool for controlling your aircraft. The real-time video feed is especially helpful, providing a clear view of your surroundings and allowing you to take photos and videos of your flight.