I will not replicate the available feature set rather invite you to browse to the extension page and read there.
If you have any questions don't hesitate to contact me.
Notice: I am in the process of reorganizing the website and code repo, but all issues (not support request) can be posted in the github issues list in the mean time. Support request are welcome through my websites contact form.
Also, maybe the optional Google Map plugin is changed, because This K2 extra Fields plugin gives an error message saying that the Google map plugin is not installed (even though it is installed and enabled). The problem is that this plugin is looking for the Google map plugin in the content directory when it is actually in the system directory.
Since there is no forum, hopefully this may helps someone else that has this issue.
I used it for the Google Map plugin but I can see this plugin has some features that really extend the use of extra fields.
I had a syntax error in naming the extra field (didn't read instructions properly) that was very quickly addressed by Gobezu when I contacted him for support through the Contact form on his website.
Save yourself some time & read the syntax instructions for naming the k2 extra field that is in the first few lines of the plugin's Usage instructions.
Need K2 extra fields with fancy features? This plugin can probably handle what you need!
I just love this plugin.
Thank You Gobezu!