# BetaFPV Beta75X 2S Brushless Whoop
The BetaFPV Beta75X (opens new window) is a very small quadrotor that can be flown indoors or outdoors, FPV or line-of-sight.
# Where to Buy
The Beta75X can be bought from a number of vendors, including:
In addition you will need:
- An RC transmitter. Beta75X can ship with a number of receivers. PX4 is compatible with all of them, but make sure to select the version that matches your transmitter.
- LiPo battery charger (vehicle ships with one battery, but you may want spares).
- FPV goggles if you want to fly FPV. There are many compatible options, including these ones from Fatshark (opens new window).
support is completely independent of PX4/flight controller.
# Flashing PX4 Bootloader
The Beta75X comes preinstalled with Betaflight.
Before loading PX4 firmware you must first install the PX4 bootloader. Instructions for installing the bootloader can be found in the Omnibus F4 topic (this is the flight controller board on the Beta75X).
You can always reinstall Betaflight later if you want!
Once the bootloader is installed, you should be able to connect the vehicle to QGroundControl via a USB cable.
At time of writing Omnibus F4 is supported on the QGroundControl Daily Build, and prebuilt firmware is provided for the master branch only (stable releases are not yet available).
To install and configure PX4:
- Load PX4 Firmware.
- Set the Airframe to BetaFPV Beta75X 2S Brushless Whoop.
- Continue with basic configuration, including sensor calibration and radio setup.