It looks like a mini CD with music, but when you open it up, it really is a small scale for weighing your portions. It will weigh 300 grams in 0.1 gram increments, and can easily be switched to ounces. You can use the Tare button to put your plate on the scale, press the Tare button to zero the display and then add you portion for precise portion weight. So discrete it even comes with four different inserts to fit your type of music. Batteries are included.