FY20A Stabilizer

Part of comprehensive FPV/OSD/Autopilot system.

• list price $110
• good for planes and quadrocopters
• inertial motion sensing
• 3-axis gyro, 3-axis accelerometer
• 20g
• controlled by channel 5.
• supports 3 modes: stabilized flight, manual flight, and 3D mode.

Their blurb:

• Leveled Flight (when you need it!) -- The FY-20A will automatically level your aircraft. If you are just learning to fly, this will help you gain experience, log more flying time and increase your confidence. You can leave it ON from take off to landing, for a really stress free flight!
• Emergency Recovery -- In case you lose orientation or you feel the aircraft is out of control, activate the FY-20A and release of the control sticks. The FY-20A will automatically bring the plane back to level flight.
• Precision Flying: For experienced pilot -- FY-20A will help you achieve more leveled and precise flight paths, especially when flying and landing in strong wind.
• First Person View (FPV) -- For long distance flying or FPV, the FY-20A will take on the job of leveling the plane for you. Just point the plane where you want to go and enjoy the view!

Resources:

• home page
• rcgroups thread
• pdf manual