Used. Tested and working. The console reads game cartridges properly.This item is 100% authentic and made in Japan.A socket for UNIBIOS 4 is installed, and the original ROM is included. The console and controller show scuffs and scratches from normal use.Please note: The ball section of the controller stick has a visible crack.An official power adapter and cable are included. Please note that the box and instruction manual are not included. This is a 5V model, so it is very important to use a dedicated 5V power supply. Using an AC adapter from later AES models (9V/10V) may cause permanent damage to the console. Please check your AC adapter before use. About Universe BIOS 4.0 (UNI-BIOS 4.0) Using BIOS version4.0, you can set arcade or AES mode, cheat function, etc. When starting the BIOS screen (to insert the card), press the handle ABC to enter the BIOS setting. Press BCD to enter the tuning mode to set the difficulty, etc. In the game, you can also press the start button + coin button to call out the menu to select the cheat function and reset and other functions.Codes for jukeboxes (sound tests), use of hidden characters, unlimited use of super special moves, etc, You can also change the regional (language) settings for the Japanese and European versions, and enjoy the Neo-Geo to the fullest. You will be able to enjoy Neo Geo to the fullest.