Rodent Rat

How effective are the electric rodent/rat/mice repellent devices?
I am referring to the devices that emit sound waves to repel the rodents. Has anyone used these devices before? Are they really effective as their manufacturers claim them to be?
At first they do actually work, at least the one I was using. But after a few weeks I think the mice adjust to the sounds and are not effected by it anymore as the do come back. I would save your money and just buy mouse traps, they sell the no kill traps and they work well.
Good Luck,
Casey
SWAMP RAT Rodent Waki
