1. Input 5V and more than 1A, TYPE port 2. Yaw Button : on Yaw(ON/OFF), Yaw motor rotate and display show "series number" and "OK" 3. Roll Button : on Roll(ON/OFF), Roll motor rotate and display show "series number" and "OK" 4. Pitch Button : on Pitch(ON/OFF), Pitch motor rotate and display show "series number" and "OK" 5. If the display shows "NG" or Red words, it means the motor not working well. Support Models:for 3 Yaw, Roll, Pitch Test for 3 Pro Yaw, Roll, Pitch Test for 3T Yaw, Roll, Pitch Test for Yaw, Roll, Pitch Test for 3 Cine Yaw, Roll, Pitch Test for 3 Classic Yaw, Roll, Pitch Test for Air 3 Roll, Pitch Test for Air 3S Roll, Pitch Test Colour:As Shown Material:plastic Package Contents: 1 x AD28 Gimbal Motor Test Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.