Features: 1. backlit LCD display, detachable split design. 2. have the screen auto-reverse function. 3. Automatically detect the horizontal angle. 4. with the delay angle to zero and lock function. 5. can detect the angle range of ±60 ° 6. for 200-800mm main rotor. 7: will turn itself off after 8 minutes of built-in power saving features standby power.