what is "saver"?

I know that it is used on the servo. What is its function?? Can someone teach me??

thanks for your reply in advance.

Ha Ha, servo saver is used to save the sevro.
When the anti-force is bigger than the servo can sustain the saver will open then the servo can be saved. will not damage the gear or burn the servo.

                               
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用途：
1) attach波頭連接推杆，把servo的動力有效地傳送；
2) 用彈弓保護servo及轉向系統免受外來撞擊，把衝擊吸收。

oh, I understand la... thanks....