Mathmatic Sales Inc S-999 Handlheld Calculator - tested. Works well, back battery cover doesn't stay on. Some wear as shown, occasional double actuation on buttons but generally works very nice. Comes with box and info for a different calculator I believe, not sure what the deal is there. I have tested the calculator but I managed to pull a tab off the 9v battery I was using for testing so don't have any pictures of it on - it displays red text. If you have any questions or need more information, please feel free to send me a message. Thanks for looking!