I am not afraid to design a key ring when I go home late at night

For the user to consider the following points as the starting point: 1. Put the bag and grab it very well. 2. You can hang on your hand when you walk the night road, and take it as a weapon in case of an emergency. 3. Going home and hanging on the door is easy to find it. I started to work on the mini harmonica, mainly because I liked his small and cute shape. It is a kind of object that can interact with people. If you wear it on your body, you can play simple music (4 holes). 8 tone) Limited large size ring Element: Mini Harmonica. American Veterans. Copper Products. American Old Keys Maintenance method: Most of the material of this product is copper. Please keep it in a dry place, avoid taking it in a damp place to avoid chemical changes. It can usually be wiped with a dry cloth. Customizable (photos are shown in the photo) License plate and small key can choose to see the picture Harmonica can be changed color, or add accessories Pin size: 10.8x7.3x2.3x1 Please write to confirm the details first. Thank you Thanks Origin / manufacturing methods United States Taiwan