HP Slim Keyboard Expansion Pack for iPAQ 3800, 3900, 4100, 5100, 5400, 5500 Series Enjoy complete keyboard functionality with this compact add-on Take notes more easily and efficiently Protect the display during transit with the transparent, type-through keyboard cover Leave the keyboard attached to your iPAQ; no need to remove it when docking or changing a battery Compatible with 3800, 3900, 5100, 5400, 5500 series iPAQs