Dimension (mm): 28*28*20
Digital proportional R/C system
Operating voltage: 4.8V~6V
Operating temperature: -10℃ ~ +45℃
Operating current: 80A

Functions:
1. Minimizes changes in an aircraft's attitude by wind etc
2. Angular acceleration commands used
3. Sensor vibration proofing
4. Simple sensitivity adjustment

The helicopter he?s flying is the Legend 450 and the gyro he?s using is GY48V Headlock Gyro which can be found here https://www.xheli.com/60p-dy-1017.html.  Notice the stability of the helicopter in this video and how close he gets to the ground flying it upside down and holding it at that level; that?s the work of the gyro.