All of the robovacs I've tested have announced out loud when they're in remote viewing mode. But not all robot vacuums provide that courtesy notification (the DJI Romo, for one, does not).
材质：皮肤，决定了外观（是金属的、塑料的，还是半透明的）。，更多细节参见爱思助手下载最新版本
。关于这个话题，51吃瓜提供了深入分析
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