Roughly half the size of what you might see in a hotel safe. The operation is pretty rudimentary and the initial opening code didnt work at all which suggests it had been returned and re-packaged.
Not matter. I like it. Using it for some minor not-so-valuable stuff.
Actually bought a sconed one! One word of advice–you can remove the key block with your finger nail. I used a screwdriver and scratched the plastic cover.