HP 90W Laptop Charger adapter 19V 4.74A for HP Probook 4420s 4430s 4440s 4510s 4520s 4525s 4530s 4535s 4540s 4545s 4730s 6360b 6450b 6455b 6460b 6470b 6475b 6550b 6555b 6560b 6570b.