Detail Specification:-Material: Plastic.Size: 5.11 x 2.9 x 1.4in.(13 x 7.5x 3.5cm). Bike Horn Bicycle Police Sound Light - FRESHOOL Bike Electric Horn 6 LED Lights 4 Sounds Trumpet Cycling Horn Bell Siren Warning Safety Waterproof Bicycle LED Lights For Bike Bicycles Keep your kid Safe by warning or noticing others. 113g --- Battery: 2 x AA battery (not included) --- Application: Suitable for 28-30mm diameter tube bicycles --- Need to unload the two screws of the base to open the lid to install batteries Package Included: 1 x Bike front light with bell 1 x Mounting bracket 🔊【Universal】--- Can be used for a wide range of activities: road biking, city commuting, hybrid bikes, kids bikes etc. This personal protective equipment gives variety of benefits as I mentioned above. 🔊【Loud Bell Sound】--- A Loud bell to draw people's attention on street. A caution tape is also be used to draw people's response on street. Cable Length:10in (26cm). Long lasting: This product is durable for this reason it is long lasting as well. Our led light bars give the effect of flash that is very important nowadays while wandering on the road. High Quality]our horn bicycle led light is made of plastic, Bike LED Light is Waterproof, Reliable and Practical, 4 Loud Siren Sound,6 red blue led light... 4 Button Controls)Four kinds of sound effects are free to choose, and 6 LED light flicker with the ringing of the bell, especially in places with insufficient... 🔊【4 Button & 6 Light】--- 4 button controls: four buttons control 4 kinds of sound. Bicycle Light+ Horn Cycling Bike Bicycle Flashlight Front Lights Led Handlebar Ring Horns Horn Electronic Alarm 🔊【Easy Installations】--- The bike bell is very easy to install on your bike. 6 red blue led light with bike siren. Fun purpose: Your childrens can use this for fun purpose like playing police pretend play games that will be a joy for them with loud and decent soundEmergency purpose: According to product specification flashing light is available though it can be used for emergency purpose as well.