Ionic Listview with checkboxes

Hi i am new for Ionic and in my listview each row having checkbox and my application user have a option to select multiple items using checkbox,How ca i implment this functionality can some one help me please.

.html:

<ion-content padding>
  <ion-list>
    <ion-item *ngFor="let contact of contacts">
        <ion-label> </ion-label>
        <ion-checkbox (ionChange)="updateCheckbox()"></ion-checkbox>
    </ion-item>
</ion-list>
</ion-content>

.ts:-

export class CheckboxListPage {

  contacts:any

  constructor(public navCtrl: NavController, public navParams: NavParams) {

    this.contacts = [{"id":1,"name":"ram1"},
    {"id":1,"name":"ram2"},
    {"id":1,"name":"ram3"},
    {"id":1,"name":"ram4"];
  }
}