Patent pending number Stamped on white sticker on the bottom
overall: 2 5/16 in x 9 1/2 in x 6 1/2 in
On the front there is an on/ off switch to the right of a red LED light. There are also two 13 pin male connectors to the right of the "Atari 850" logo. On the back there is a 4 connector serial interface.