Other Useful Accessories
Depending on how you use your iPad, investing in noise-canceling earbuds or headphones (which are not wireless, but connect to your iPad via its earphone jack), may make watching or listening to video or audio on your iPad an absolute pleasure, especially while on an airplane or in an otherwise noisy environment.
To watch videos or enjoy top-quality audio from your iPad while at work or at home, consider purchasing a set of high-quality external speakers that connect to the iPad. Again, this is an accessory offered by a wide range of companies. External speakers can cost as little as $20 or as much as several hundred dollars, depending on their quality.