I can't really imagine why you would want to completely block all cell signals in your home. Sure, cellphones can be annoying when they ring an inopportune times, but to block them altogether for you and any guests you have? That's a little crazy.
I guess that's why this cell phone jammer is disguised like a generic picture of some boats. People will just think they're in a dead zone and you happen to have bad taste in art rather than knowing the truth that you're a crazyperson who secretly prevents their personal phones from working, even in an emergency. All this for only $150!