This is a clicker for dog training. The "Multi-Clicker" allows for 3-stage sound adjustment, but it has only been tested and is unused. The packaging shows signs of aging and some dirt. Please check the condition in the photos. The red one has been used a few times for clicker training, but it wasn't effective for my dog, so it has been stored for a long time. Although they are old, I have confirmed that the sound hasn't changed, and there appears to be no rust, dirt, or scratches to the untrained eye. How about it, those who are thinking of trying clicker training? I will be listing these until the end of this month, and if there are no purchases, I will dispose of them.