This is a blue detective cop toy gun. It's approximately 13cm (or 5 inches) long. It's a fake gun, and the actual item might vary slightly from the photo.

Using this toy gun is easy. Just hold it in your hand like a real detective and have fun pretending to solve cases. When playing, keep it away from small children who might put it in their mouths. Don't use it to hit or throw at others. To keep it in good condition, wipe it with a dry cloth regularly. If it gets dirty, you can use a mild soap and water to clean it gently, then dry it thoroughly before storing it.