Additional features include optional encryption, network support and much more.
额外的功能包括加密选项，网络支持等功能。
For the additional safety the bottom edge safety is an optional safety device.
光电感应安全开关是门柱下方一套对射的红外线装置。
For the additional safety the bottom edge safety is an optional safety device.
光电感应安全开关是门柱下方一套对射的红外线装置。
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