As much as I love mine, you probably do not want one.
It is the form sent to people who were identity theft victims. The IRS sends you one every year with a PIN to use when filing tax returns. I started getting CP01A forms the year after someone else filed a tax return using my name and social security number. We now get letters in January with our new tax filing PINs.
If you would like, you can request an Identity Protection Personal Identification Number from the IRS.
Benefit: makes it much harder for someone to file a tax return using your information.
Drawback: if you lose the letter the IRS sends you in January tax filing is much more complicated. Ditto if you move without telling them.
Having lived through the pain of someone filing a return using my information I love mine.