Water Proof for outdoor installationAuto-drop-arm function: The middle arm can drop down automatically (default) (or free passing) when the power is off. The middle arm have to manually lift when the power is on again. Multi-alarm function: When arms are pushed by force illegally, alarm will be triggered automatically and arms will be set locked (the duration of the alarm and lock is adjustable by software). Anti-reverse-rotation function: Reverse rotation will be forbidden once the arms have moved to pre-set degree (adjustable by software) from home. Emergency-escape function: The middle arm will drop down automatically by pressing the emergency button which can be remote-controlled whether the power is on or not.
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