diff --git a/front_end/emulated_devices/module.json b/front_end/emulated_devices/module.json
index 438e502a50..e9422a7825 100644
--- a/front_end/emulated_devices/module.json
+++ b/front_end/emulated_devices/module.json
@@ -499,7 +499,7 @@
                         "width": 533,
                         "height": 320
                     },
-                    "device-pixel-ratio": 1.4,
+                    "device-pixel-ratio": 1.5,
                     "vertical": {
                         "width": 320,
                         "height": 533
@@ -525,6 +525,78 @@
                 ]
             }
         },
+        {
+            "type": "emulated-device",
+            "device": {
+                "show-by-default": false,
+                "title": "Microsoft Lumia 550",
+                "screen": {
+                    "horizontal": {
+                        "width": 640,
+                        "height": 360
+                    },
+                    "device-pixel-ratio": 2,
+                    "vertical": {
+                        "width": 640,
+                        "height": 360
+                    }
+                },
+                "capabilities": [
+                    "touch",
+                    "mobile"
+                ],
+                "user-agent": "Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; Microsoft; Lumia 550) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Mobile Safari/537.36 Edge/14.14263",
+                "type": "phone",
+                "modes": [
+                    {
+                        "title": "default",
+                        "orientation": "vertical",
+                        "insets": { "left": 0, "top": 0, "right": 0, "bottom": 0 }
+                    },
+                    {
+                        "title": "default",
+                        "orientation": "horizontal",
+                        "insets": { "left": 0, "top": 0, "right": 0, "bottom": 0 }
+                    }
+                ]
+            }
+        },
+        {
+            "type": "emulated-device",
+            "device": {
+                "show-by-default": false,
+                "title": "Microsoft Lumia 950",
+                "screen": {
+                    "horizontal": {
+                        "width": 640,
+                        "height": 360
+                    },
+                    "device-pixel-ratio": 4,
+                    "vertical": {
+                        "width": 360,
+                        "height": 640
+                    }
+                },
+                "capabilities": [
+                    "touch",
+                    "mobile"
+                ],
+                "user-agent": "Mozilla/5.0 (Windows Phone 10.0; Android 4.2.1; Microsoft; Lumia 950) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Mobile Safari/537.36 Edge/14.14263",
+                "type": "phone",
+                "modes": [
+                    {
+                        "title": "default",
+                        "orientation": "vertical",
+                        "insets": { "left": 0, "top": 0, "right": 0, "bottom": 0 }
+                    },
+                    {
+                        "title": "default",
+                        "orientation": "horizontal",
+                        "insets": { "left": 0, "top": 0, "right": 0, "bottom": 0 }
+                    }
+                ]
+            }
+        },
         {
             "type": "emulated-device",
             "device": {