Display the letters by swing portable device on which Accelerometer and LED are mounted. The letter could be changed or programmed by the final user.
通过挥动手持设备实现在空中显示文字。用户可自己编写显示的文字。
2
Adopt computer controlling, digital display, not brushes the electrical machinery, can be programmed and operated, there is RCF that is calculated and established automatically.
采用微机控制、数字显示、无刷电机、可编程操作，具有RCF自动计算与设定。
3
Adopt computer controlling, digital display, not brushes the electrical machinery, can be programmed and operated, there is centrifugal force that is calculated and established automatically.