Advantages:- Small size with keychain、 easy carry- High quality brass、 luxury design- Strict produce system and design、 with loud voice Application:Outdoor survival、 teaching needs、 fashion decorate... Specifications:- Size: 57*10*10mm- Quantity: 1 piece Mirror light and Vintage brass color optional、 color send random、if you need choose color、 please remark in orders、 thanks.