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An optical guidance system was added to Mod II.  This provided, among other capabilities, the ability to optically identify the black wall sockets that contrasted with the white wall.

An optical guidance system was added to Mod II.  This provided, among other capabilities, the ability to optically identify the black wall sockets that contrasted with the white wall.

在 Mod II 中还增加了一个光学制导系统。除了其他能力，这给它提供了能够光学识别黑色墙壁插座与白色墙壁不同的能力。

在 Mod II 中还增加了一个光学制导系统，这给它提供了能够光学识别黑色墙壁插座与白色墙壁不同的能力。