Headphones at RadioShack.com - the nation's most trusted consumer electronics specialty retailer. Impedance: 16 ohmsMaximum input power: 0.02 WFrequency range: 17 - 22000 HzSensitivity: 105 dB at 1 KHzConnector: 2.5 mm (gold-plated). Official HP stereo earbud style headset headphones with 2.5 mm jack as provided with the iPAQ hw6500 when new. Sound is channelled directly into your ears. Eliminate carrying or buying 2.5mm headphones for travel and White Online Pages convert it with this adapter to use 3.5mm headphones! The choice is yours!. I figured it out and was able to

make a set of 2.5mm headphones from a 3.5mm set. I bought the L shaped 2.5mm plug at Radio Shack. I purchased a $20.00 pair. Page 2-2.5 MM Mono to Stereo Adapter Tungsten C.. 3.5 mm headphones

or a bulkier adapter that has Sure-Loc Archery jacks