export class EmployeeService {

  employees : AngularFireList<Employee>;
  Employee : AngularFireObject<any>;

  constructor( public af : AngularFireDatabase) {
this.employees = this.af.list<Employee>('/employees/employees');
  }
  getEmployees()
  {
    return  this.employees.valueChanges();
  }
}
*Heres employee component : *
  employees:Employee[];
  constructor(public employeeService : EmployeeService) {

  }

  ngOnInit() {
    this.employeeService.getEmployees().subscribe(employees=>{
      this.employees=employees;
      console.log(this.employees);
    });
  }
Heres the employee.html:
    <tr *ngFor="let item of employees">

      <th >{{item.firstName}}</th>
      <th >{{item.lastName}}</th>
      <th >{{item.email}}</th>
      <th >{{item.country}}</th>
      <th >{{item.city}}</th>
      <th >{{item.phone}}</th>
      <th >{{item.salary}}</th>
      <th >{{item.$key}}</th>


    </tr>
any one is having an idea?