These features are available on some players, but not on all. Furthermore, the recording options may be limited. A player that can record only wave files will limit your recording capacity. (One minute of stereo wave file is about 10 megabytes, compare with one megabyte in mp3 format.) There has long been the promise of music kiosks where you can simply charge a flash memory stick with new songs. Perhaps we will see this in the coming year.

The second aspect to controlling what you hear is the audio environment itself. You connect your mp3 player to your physical self through earphones, or you can plug it into your computer, your hi-fi system, and even use a wireless connection in your car. Not surprisingly however, one of the weakest links in the personal portable mp3 player is the earphone set. Most players come with a set of earphones, usually in the 'bud' style. Not everyone is comfortable with this style of earphone, and you may want to consider the earphones you use. A good quality set of earphones, (such as Shure's E4c) will enhance your listening experience for a variety of reasons. For prolonged listening, earphones need to be comfortable, both in a physical sense and in an auditory sense. Poor quality earphones are often uncomfortable to wear and deliver poor quality sound that can cause ear fatigue and subsequent long-term damage. Cheap earphones are flimsily constructed and any strong tug on the cords will cause the signal cables to break down. You also need to check out what controls the player provides you over the sound quality, and how easily they are accessed and understood. At minimum, you need volume and possibly some tonal controls, as well as track management and good visible indicators of the status of your player.

Size does matter.

The importance of weight, physical dimensions and battery life cannot be understated. Most manufacturers promote a battery life. But like mobile phones, the product usually does not prove the claim. Why is this? It often depends on how the battery life is measured. In a laboratory for example, the test may be carried out with minimal human interference. But on the jogging path, every time you touch a control, you are using some power from the battery, whether it's just to illuminate the screen, or make adjustments to the sound quality. Battery life can be compared between manufacturers to give you some idea of how different players compare, but don't rely on the manufacturer's claims to be accurate under the conditions you will be using your player. You may use your player for a few hours each day, and then recharge every night. In such a case, extremely long battery discharge life may not be too important. But if you are trekking across the Nullarbor Plain and won't see a power point for several days, battery life is going to be critical.

Weight is also another factor. Remember, devices with Hard-Drive storage weigh more and are bulkier than devices with flash memory. CD devices need to be at least as big as a CD, and many are not much bigger. Consider how you are going to wear the player on your person, and be sure it will be comfortable.

And there are accessories

There are a lot of technical things associated with audio devices. Unless you're an audiophile, you may have a limited interest in such things as the signal to noise ratio (the amount of noise that is generated outside of the signal by the players amplifiers). The fact is, most players on the market have acceptable sound fidelity and the biggest weakness can often be found in the headsets and loudspeaker systems that they are connected to. You may also want to consider the accessories that are available, either included with the purchase or available separately. This may include power adaptors, carrying cases, additional memory, car adaptors and other software options to give you access to a wider range of entertainment and information.