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diff --git a/libs/ihealth-sdk/doc/nt13b.md b/libs/ihealth-sdk/doc/nt13b.md
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+# NT13B Workflow
+
+## Import NT13B Module
+
+```js
+import {
+  NT13BModule,
+  NT13BProfileModule
+} from '@ihealth/ihealthlibrary-react-native';
+```
+
+## APIs
+
+### Add and remove listener
+
+```js
+// add
+notifyListener = DeviceEventEmitter.addListener(NT13BModule.Event_Notify,  (event) => {
+    console.log(event);
+});
+
+// remove
+notifyListener.remove();
+```
+
+### set measurement listener
+
+```js
+NT13BModule.measure(mac);
+
+// response
+notifyListener = DeviceEventEmitter.addListener(NT13BModule.Event_Notify,  (event) => {
+    if (event.action === NT13BProfileModule.ACTION_MEASUREMENT_RESULT) {
+        console.log(event[NT13BProfileModule.RESULT]);
+        console.log(event[NT13BProfileModule.UNIT_FLAG]);
+    } 
+});
+```
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