The Qualarc PCSDB-MD Parcel Chest Secure Delivery Box is 20.50" H x 18" W x 12.75" D. This medium size ParcelChest can be wall or ground mounted. The Medium ParcelChest accepts packages up to 16" x 15.50" x 9.5". Packages can be delivered by simply lifting the lid, placing parcel inside the ParcelChest and closing the lid. Then the delivery person simply pushes the locking button on the front of the box to secure the package. Package retrieval is easy, just insert your key and turn the lock button to unlock. It includes installation and delivery instructions. Each ParcelChest comes with a delivery instructions sticker. Apply sticker to the outside of your box.