Slim Design with Snap Lock. Holds: Smart Phone, Credit Cards and Currency The outside dimensions are 5.25" high x 3.25" wide by 1.25" deep. When the case is opened, the dimensions on each side are: 4.75" high x 2.75" wide by 0.5" deep. When the case is opened., there is an elastic strap on either side of the case so that your phone, credit cards, cash, coupons, etc will not fall out. If you're buying this for a cell phone, please measure the phone to make sure it will fit.