Audio Equalizer:

This function allows you to customize your music by changing the bass, treble and more so it will sound how you like it. Many players also come with pre-set modes like rock, classical, custom and so forth.

Audio Format:

The most flexible mp3 flash players can play a variety of music formats including mp3, wma and wav. iPods are the only ones that support aac and aiff.

Backlight:

The player's screen has a backlight so you can view it in the dark.

Battery Charge Time:

The total time it takes to fully charge the battery.

Battery Life:

How long the battery will last on continuous play from full charge to completely dead. This is displayed in hours.

Battery Type:

The type of batteries the MP3 player accepts or includes. Most use some kind of rechargeable lithium technology, but some still use standard alkaline.

Built-In Clock:

The MP3 player includes a clock.

Display Resolution:

The higher the resolution, the clearer the images can display. The best players can display up to 720x480; however, 320x240 is more common. Typically, the smaller the media player screen the lower its resolution.

Display Type:

The technology used in the display screen. Most MP3 players have an LCD or OLED screen.

FM Tuner:

Player can play FM radio, some can also record radio or offer the ability to preset stations.

Headphones Type:

The type of headphones included with the purchase of the MP3 player.

Interface:

The way the MP3 player connects to a computer. The most common interface is through USB port.

Main Storage Type:

How the primary memory is stored in the MP3 player. Almost all MP3 players include internal or built-in storage. However, a few still use external memory cards like SD and Compact Flash.

Memory Card Slot:

The MP3 player includes an expandable memory slot for additional data storage.

MP3 Depth:

The MP3 player’s depth measured from front to back.

MP3 Height:

The height of the MP3 player from the bottom to top.

MP3 Screen Size:

The MP3 player’s screen size measured diagonally.

MP3 Weight:

How much the MP3 player weighs usually measured in ounces.

MP3 Width:

The width of the MP3 player measured horizontally.

Number of Songs:

The estimated maximum number of songs the MP3 player can store assuming a song is four minutes long and encoded at 128kbps.

Signal-To-Noise Ratio:

This represents the difference between the level of the audio signal and interference; the larger the number the cleaner the sound.

Storage Capacity:

This represents the difference between the level of the audio signal and interference; the larger the number the cleaner the sound.

Video Formats:

The MP3 player’s compatible video file formats. Compatible formats vary from each manufacturer. Common video file formats include WMV, AVI and MP4.

Warranty:

The MP3 player includes a warranty. Most are limited to time and excessive mishandling. Warranties vary from 90 days to the lifetime of the MP3 player.

Touch Screen:

The MP3 player has a touch sensitive screen that can be navigated using your finger or stylist.

WiFi:

The device has the ability to connect to the Internet or transfer information wirelessly when within range of a wireless network or other specific portable device.