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Main controller can be set to half open or constant open,and can be connected to safeguard system,smoke alarm system ,open voice selective call system etc. It also has return function, when it meets an obstacle. Push-pull windows make operator using facility ,avoiding exposuring,and what is more,make the controller Dust Proof and Damp Proof.
PS: It has return-travelling function, that means it still can travel to opposite direction, not always when it meets an obstacle.
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