Airplane Adapter:
Several airlines charge customers to use their headphones. You can enjoy in-flight entertainment for free with the HP-21 airplane adapter. The airplane adapter is compatible with two-prong style jacks. Simply plug your headphones into the adapter and you’ll be on your way to airplane entertainment.

iPhone Adapter:
You can use your iPhone without needing the Apple branded pair of headphones that came with your iPhone. The HP-21 iPhone adapter will connect any pair of headphones to your iPhone. You’ll no longer be limited to the Apple headphones – you can use your favorite pair instead!

Cell Phone/PDA Adapter:
Stop spending unnecessary amounts of money on a brand-specific earpiece for your cell phone or PDA. The HP-21 cell phone/PDA adapter allows you to connect any earpiece or pair of headphones you own to your cell phone or PDA.

Dual Headphone Adapter:
Share your favorite music with a friend using the HP-21 dual headphone adapter. The adapter allows two pairs of headphones to be connected to one jack. Ideal for any device two people want to enjoy together but features only one jack.

Quarter-Inch Stereo Adapter:
Enjoy all the features of your home stereo system without disturbing those around you with the HP-21 quarter-inch stereo adapter. The adapter connects full-size stereo headphones to your home stereo equipment.

20-Foot Extension Cord:
The included 20-foot extension cord extends the length of your headphone cord giving you greater flexibility to sit or walk about as you please. You’ll no longer have to worry about sitting close to your audio source. Instead, you can expand your private listening space up to 20 additional feet.

What’s In the Box
Airline adapter, iPhone adapter, Cell Phone/PDA adapter, quarter-inch adapter, dual headphone adapter and 20-foot extension cord