HP
712920-001
is compatible in the following HP Models:
HP ProBook 4500 Notebook PC series
HP PROBOOK 4540S NOTEBOOK PC - F0W13PA
HP PROBOOK 4540S NOTEBOOK PC - F3L42US
HP PROBOOK 4540S NOTEBOOK PC - G4T99UT
HP PROBOOK 4540S NOTEBOOK PC (ENERGY STAR) - E5H06PA