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+# PO3 Workflow
+
+## Import PO3 Module
+
+```js
+import {
+  PO3Module,
+  POProfileModule
+} from '@ihealth/ihealthlibrary-react-native';
+```
+
+## APIs
+
+### Add and remove listener
+
+```js
+// add
+notifyListener = DeviceEventEmitter.addListener(PO3Module.Event_Notify,  (event) => {
+    console.log(event);
+});
+
+// remove
+notifyListener.remove();
+```
+
+### get battery
+
+```js
+PO3Module.getBattery(mac);
+
+// response
+notifyListener = DeviceEventEmitter.addListener(PO3Module.Event_Notify,  (event) => {
+    if (event.action === POProfileModule.ACTION_BATTERY_PO) {
+        console.log(event[POProfileModule.BATTERY_PO]);
+    }
+});
+```
+
+### start a measurement with app
+
+```js
+PO3Module.startMeasure(mac);
+
+// response
+notifyListener = DeviceEventEmitter.addListener(PO3Module.Event_Notify,  (event) => {
+    if (event.action === POProfileModule.ACTION_LIVEDA_PO) {
+        console.log(event[POProfileModule.PULSE_WAVE_PO]);
+        console.log(event[POProfileModule.PI_PO]);
+        console.log(event[POProfileModule.PULSE_STRENGTH_PO]);
+        console.log(event[POProfileModule.BLOOD_OXYGEN_PO]);
+        console.log(event[POProfileModule.PULSE_RATE_PO]);
+    } else if(){
+        // final result
+        console.log(event[POProfileModule.PULSE_WAVE_PO]);
+        console.log(event[POProfileModule]);
+        console.log(event[POProfileModule.PI_PO]);
+        console.log(event[POProfileModule.PULSE_STRENGTH_PO]);
+        console.log(event[POProfileModule.BLOOD_OXYGEN_PO]);
+        console.log(event[POProfileModule.PULSE_RATE_PO]);
+    }
+});
+```
+
+### get data stored in the po3 device
+
+```js
+PO3Module.getHistoryData(mac);
+
+// response
+notifyListener = DeviceEventEmitter.addListener(PO3Module.Event_Notify,  (event) => {
+    if (event.action === POProfileModule.ACTION_NO_OFFLINEDATA_PO) {
+        console.log("There is no more data stored in the po3 device.");
+    } else if (event.action === POProfileModule.ACTION_OFFLINEDATA_PO) {
+        const dataArray = event[POProfileModule.OFFLINEDATA_PO];
+        for (let i = 0; i < dataArray.length; i++) {
+                let offlineData = dataArray[i];
+                console.log(offlineData[POProfileModule.MEASUREMENT_DATE_BP]);
+                console.log(offlineData[POProfileModule.HIGH_BLOOD_PRESSURE_BP]);
+                console.log(offlineData[POProfileModule.LOW_BLOOD_PRESSURE_BP]);
+                console.log(offlineData[POProfileModule.PULSE_BP]);
+                console.log(offlineData[POProfileModule.MEASUREMENT_AHR_BP]);
+                console.log(offlineData[POProfileModule.MEASUREMENT_HSD_BP]);
+                console.log(offlineData[POProfileModule.DATAID]);
+            }
+    }
+});
+```
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