Riddex Plus is not a spray. It is an electrical device that plugs into your household socket. While it may work, (I have used Pest Offense for several years and it works really well) Dynamic Response Group-Riddex Plus is charging way too much for S/H. I just ordered Riddex Plus (2 sets) and was only told S/H was $8.99 per unit. Since they were being sold 2 at a time - that would be $8.99 for two you'd think. BUT NO ! Since I ordered two sets, I was charged $8.99 per device (4) for a total of $35.80 just for S/H!! When I called, they were willing to deduced only $17.50 from the $95.70 bill.
The product I received from Riddex Plus was made in China, was marked with a company in Florida, has an address in Van Neys, CA and two more addresses in Texas!! Yeah, try to pin them down!
I recommend you go to a hardward store and see if they carry something else. Don't get the sonic or ultra-sonic product. They might work in an empty room but don't work otherwise.
Not a happy camper!