diff --git a/app.py b/app.py
index c02e7c9..c4bf621 100644
--- a/app.py
+++ b/app.py
@@ -19,7 +19,7 @@
 pitchThreshold = 10
 rollThreshold = 10
 occlusionThreshold = 0.9
-eyeClosureThreshold = 0.7
+eyeClosureThreshold = 0.8
 mouthOpeningThreshold = 0.5
 borderRate = 0.05
 smallFaceThreshold = 100
diff --git a/header/facesdk.h b/header/facesdk.h
new file mode 100644
index 0000000..b5b541c
--- /dev/null
+++ b/header/facesdk.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum SDK_ERROR
+{
+	SDK_SUCCESS = 0,
+	SDK_LICENSE_KEY_ERROR = -1,
+	SDK_LICENSE_APPID_ERROR = -2,
+	SDK_LICENSE_EXPIRED = -3,
+	SDK_NO_ACTIVATED = -4,
+	SDK_INIT_ERROR = -5,
+};
+
+typedef struct _tagFaceBox
+{
+	int x1, y1, x2, y2;	
+	float liveness;
+	float yaw, roll, pitch;
+	float face_quality, face_luminance, eye_dist;
+	float left_eye_closed, right_eye_closed, face_occlusion, mouth_opened;
+	float landmark_68[68 * 2];
+} FaceBox;
+
+/*
+* Get the machine code for SDK activation
+*/
+const char* getMachineCode();
+
+/*
+* Activate the SDK using the provided license
+*/
+
+int setActivation(char* license);
+
+/*
+* Initialize the SDK with the specified model path
+*/
+int initSDK(char* modelPath);
+
+/*
+* Detect faces, perform liveness detection, determine face orientation (yaw, roll, pitch),
+* 	assess face quality, detect facial occlusion, eye closure, mouth opening, and identify facial landmarks.
+*/
+int faceDetection(unsigned char* rgbData, int width, int height, FaceBox* faceBoxes, int faceBoxCount);
+
+#ifdef __cplusplus
+}
+#endif
\ No newline at end of file