After seeing this product, I realized that I need to go to Lowe's or Home deport to buy wall amount electric box that is not provided with this product. After researching, I realized I cannot found any boxes to match this product. The product has about 5(1/2)" in diameter and the two stores only sell 4" standard electric box, thus you cannot install this external device by local code. When you return this product, your only get partial refund. I strongly recommend to buy other products that match the standard electric box to avoid the installation problems.