any of you have a solo 401k retirement plans if you're self employed?

here it says http://www.research401k.com/self-emp...solo-401k.html

1) 100% Contribution Choice: You can contribute however much you want per year.

2) Higher Contribution Limit: You can contribute more funds than any other 401k account e.g a Roth IRA, traditional 401k, etc.

what is the contribution limit for a solo 401k?