This designates if an iPod can be docked the particular device. This feature applies it to home DVD/Blu-ay players, iPod accessories, alarm clocks, and more. When an iPod is docked, it will charge the iPod. Some devices will support the playback of video off of a docked compatible iPod. Some players include a dock or have one built-in, while others require you to purchase it separately.
The type of battery the item uses. Some batteries are rechargeable, while others are not.
Rechargeable alkaline, nickel cadmium, nickel metal hydride, lithium ion, and lithium ion polymer are all examples of rechargeable batteries.
Some batteries are integrated and built into the item, while others are removable.