HOBBYMATE FBL Rc Helicopter Pitch Gauge for 250-800 Size Flybarless Helis W/Gyro Sensor LCD Display for FBL Flybarless Rc Helicopters, Trex 250 450 500 550 600 700 series LCD display with backlight, detachable split design Screen auto-reverse function Automatically detect the horizontal angle Delay angle to zero and lock function. Detect the angle range of 60 , For 250-800mm main rotor