select item change in angular 6 code example

Example: onchange event angular select

-------------For Two Way Data Binding-----------------
<select [ngModel]="selectedDevice" (ngModelChange)="onChange($event)" name="deviceText">
    <option [value]="i" *ngFor="let i of devices">{{i}}</option>
</select>

onChange(event){
selectedDevice=event;
  -----
  -----
}