Features: brand new and high quality Three sounds of for police car, fire truck, ambulance. Easy and convenient to install and remove. High detailed simulation, derived from real car design to increase the authenticity of the RC car. Small size and lightweight, easy and convenient to carry. Nice spare parts to upgrade and modify your for cars. Specifications: Material:Plastic, Metal and Wire Size: Approx. 8.1x3.1x3 for cm/3.18x1.22x1.18 inches(Package) Note: 1.Please allow 0-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3.Other parts are not included. Thanks for your understanding. Package includes: 1 x Sound Group Small Speaker