diff --git a/configs/config_phone_turnback.json b/configs/config_phone_turnback.json
new file mode 100644
index 0000000..7e46ae8
--- /dev/null
+++ b/configs/config_phone_turnback.json
@@ -0,0 +1,21 @@
+{
+    "MonitorWindow": false,
+    "WindowPrefix": "",
+    "image": "./images/phone_turnback/eye.png",
+    "view": [
+        286,
+        231,
+        37,
+        36
+    ],
+    "thresh": 0.9,
+    "white_delay": 0.0,
+    "advance_delay": 0,
+    "crop": [
+        0,
+        0,
+        0,
+        0
+    ],
+    "camera": 3
+}
\ No newline at end of file
diff --git a/images/phone_turnback/eye.png b/images/phone_turnback/eye.png
new file mode 100644
index 0000000..c88172d
Binary files /dev/null and b/images/phone_turnback/eye.png differ
diff --git a/src/rngtool.py b/src/rngtool.py
index 9e37954..7ccca4a 100644
--- a/src/rngtool.py
+++ b/src/rngtool.py
@@ -65,7 +65,10 @@ def tracking_blink(img, roi_x, roi_y, roi_w, roi_h, th = 0.9, size = 40, Monitor
                 exit()
         _, frame = video.read()
         if not MonitorWindow:
-            frame = cv2.resize(frame,(960,540))
+            size = frame.shape[::-1]
+            _, fw, fh = size
+            if fw >= 1920:
+                frame = cv2.resize(frame,(960,round(fh/fw*960)))
         time_counter = time.perf_counter()
         roi = cv2.cvtColor(frame[roi_y:roi_y+roi_h,roi_x:roi_x+roi_w],cv2.COLOR_RGB2GRAY)
         if (roi==prev_roi).all():
@@ -214,7 +217,10 @@ def tracking_poke_blink(img, roi_x, roi_y, roi_w, roi_h, size = 60, MonitorWindo
     while len(intervals)<size:
         _, frame = video.read()
         if not MonitorWindow:
-            frame = cv2.resize(frame,(960,540))
+            size = frame.shape[::-1]
+            _, fw, fh = size
+            if fw >= 1920:
+                frame = cv2.resize(frame,(960,round(fh/fw*960)))
         time_counter = time.perf_counter()
 
         roi = cv2.cvtColor(frame[roi_y:roi_y+roi_h,roi_x:roi_x+roi_w],cv2.COLOR_RGB2GRAY)