... , wifi and 3g signal at the same time, but when you just want want to block the cell phone's signal, but not bloking ... phone's signal. What functions you need, what functions you don't need, now you can use the swith to make what you need.Powerful and effective ... IS REALLY COOL, HOPE OTHERS ARE GOOD AS WELL. SEE YOU, GUYS.5. it\'s a good choice. i love it ...