[Gunner]

Everyone from the USDA down to the consumer reporting groups and PopMech have tested the sonic repellers many times over the last 30 years. Not a one got a positive result. IIRC, mice built a nest behind one operating unit. You can look this up in about three minutes flat and save yourself a lot of money.

Everybody has a solution their Gramps or Uncle Busky or neighbor told them about. Most are sheer folktale... but hey, they keep the elephants and aardvarks away, too.

If you're serious about rodent control, talk to your local ag university or county agent or equivalent. They'll tell you some specific, effective ways to control critters and pests, often a lot cheaper than anything you buy down at the hardware store. In my experience (aided with good, professional advice), there's never one solution. It has to be a combination of sealing up access holes and cracks, putting away ALL attractants, and then using traps etc. to nuke the persistent ones.