Which attachment combs does it come with?
The 32400 comes with 4 different attachments:
How long does the battery last?
I always keep it on the charging base but the battery can last up to around 2 hours.
What does zero gapping mean?
As a default setting, most clippers have a very small difference (~0.2mm) between the front and back blades. This helps to prevent nicks and cuts. You can take out the screws on these clippers and realign the blades to completely eliminate this difference and create an even closer cut. This video provides the easiest explanation as to how you can do it.
How do you care/clean these clippers?
Andis includes a brush to remove hair and a small bottle of oil which you should apply to the blades before each use.