I ordered two of these coasters and figured I'd get 7 inches tall overall. See Product Details: Product Dimensions: 12" x 12" x 3.5"; 1.6 ounces Shipping Weight: 1.6 ounces (See Shipping & Policies). Photo shows 2 units together and product description lists a height of 3 .5 inches on. "AND "TECHNICAL DETAILS". two to be contained in ONE DEVICE was 1". Maybe I should be wondering how 1" + 1" = 3.5" for ONE UNIT I would have to order seven of these things to get a 7" height according to the specs. I will refund these overpriced units (e.g. height requirements) for a full refund based on misleading photos and product details.