Targus PA870U V2 IR Foldable Keyboard for HP COMPAQ iPaq 3100 3600 3700 3800 3900 1900 2100 2200 4300 5400 5500 RZ1700 HX2100 Series PDA Targus black foldable keyboard model: PA870U V2.0 Wireless keyboard brings freedom and converience 210 rotating infrared sensor arm; Landscape feature on PDAs with screenflipping software Powered by two (2) CR2032 lithium batteries (included) 8-way navigation button to simulate mouse movement