Used microwave oven, GE brand. Works well. Uses standard mounting using two bolts in the top, but does not include bracket for mounting on wall. You will need to find that separately, or just build a little support for the back edge.
Actual dimensions: 29 7/8" wide by 16 1/4" high by 15 1/2" deep. The depth measurement doesn't include the door handle, which adds about another 2".