Angular 2+: Input decorator not reflecting checkbox

I have a component

timeBoxSelector HTML:

<input type="checkbox" [(ngModel)]="selected">

TS:

@Component({
   ...
})
export class TimeboxComponent implements OnInit {
    @Input() selected: boolean;

    constructor() {}

    ngOnInit() {
        console.log('Selected: ', this.selected);
    }
}

Now, when I create

<app-timebox selected="false"><app-timebox/>
<app-timebox selected="true"><app-timebox/>

In both cases, the checkbox initially appears as selected. Why is this the case, and how can I fix it?