Want to buy a new accessory for your Compaq iPAQ handheld PDA; but it's not available for the 22/38/39/41/43/51/54/5500 series platform yet? With Gomadic's new 31/36/3700 to 22/38/39/41/43/51/54/5500 Interface Adapter; you can convert any 12-pin iPAQ accessory to work with the new 22-pin platform. Equipped with a 12-pin series socket (female) on one end; a short 1” length of cable and a 22-pin plug (male) on the other; simply plug the old device in the socket; connect the adapter plug to the base port of the newer model and you're ready to go! This is the perfect accessory for the user who recently upgraded their iPAQ and still wants to be able to leverage their older accessories. Only Gomadic's interface adapter maps all pins from the 12-pin 31/36/3700 interface to the appropriate pins on the 22-pin 22/38/39/41/43/51/54/5500 interface ensuring 100% compatibility with every cable accessory including Phone to PDA cables; GPS antennas; Power sync USB cables; etc. Don't be fooled by cheaper imitations that only map a subset of the interface pins as they will not work with many cable accessories! The Interface Adapter cable is custom designed by engineers at Gomadic; professionally built to our specification and is available only on-line from our web site. So go ahead and extend your investment today.