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+# ECG3 Workflow
+
+## import ECG3 module
+
+```js
+import {
+  ECGModule,
+  ECGProfileModule
+} from '@ihealth/ihealthlibrary-react-native';
+```
+
+## APIs
+
+### add and remove listener
+
+```js
+// add
+notifyListener = DeviceEventEmitter.addListener(ECGModule.Event_Notify,  (event) => {
+    console.log(event);
+});
+
+// remove
+notifyListener.remove();
+```
+
+### get all connected devices
+
+```js
+ECGModule.getAllConnectedDevices();
+```
+
+### start a measurement
+
+```js
+ECGModule.startMeasure(mac);
+
+// response
+notifyListener = DeviceEventEmitter.addListener(ECGModule.Event_Notify,  (event) => {
+    if (event.action === ECGModule.ACTION_ELECTRODE_STATUS) {
+        console.log(event[ECGProfileModule.ELECTRODE_STATUS]);
+        console.log(event[ECGProfileModule.ERROR_DESCRIPTION_ECG]);
+    }
+});
+```
+
+### cancel a measurement
+
+```js
+ECGModule.stopMeasure(mac);
+```
+
+### get battery
+
+```js
+ECGModule.getBattery(mac);
+
+// response
+notifyListener = DeviceEventEmitter.addListener(ECGModule.Event_Notify,  (event) => {
+    if (event.action === ECGModule.ACTION_BATTERY_ECG) {
+        console.log(event[ECGProfileModule.BATTERY_ECG])
+    }
+});
+```
+
+### set current time to device
+
+```js
+ECGModule.sysTime(mac);
+```