Some models also include built-in FM radio.
These players don’t need an internet connection to work, though some have built-in Bluetooth or Wi-Fi.
Players that can dive into the internet can download and transfer songs wirelessly.
Claudia Rehm, Rech Chopsticks Images / Getty Images
Bluetooth-enabled players can connect to wireless headphones and earphones for less risk of tangling wires.
Some players accept memory cards for extra storage.
Like smartphones, MP3 players use rechargeable lithium-ion batteries.
Since music is their one function, MP3 players tend to have longer battery life than smartphones.
Some have water resistance to protect them from sweat or a dip in the pool.
Apps like iTunes are used to transfer music to these iPods for offline playback.
The most well-known companies creating new MP3 players these days include SanDisk and Sony.
MP3s can sound tinny compared to CD and vinyl quality.
