SpecificationMaterial :Elastic Silica gelColor :Red/Green/Blue/Black/PurpleSize:Approx.3x3.5x10cmDecibel (db):120dbVoice:4 voice to choosePower supply: Built-in 2 button battery(detachable and replaceable)Weight:33g FeaturesMade from high-quality silica gel material, which is durable, elastic, and flexible Small and exquisite appearance, looking fashion and simple It is waterproof and can be able to easily deal with rainy weather(but avoid long-term rain). Built-in 2pcs CR2032 button battery, large capacity, and energy-saving, durable battery life.Suitable for almost all kinds of handlebar The bell volume reaches about 90 decibels to effectively warn passers-by and vehicles How to Change the battery?1. Take the speaker out from The silicone shell2. Pull out the battery card slot from the speaker body3. Remove the old batteries4. Replace the batteries with new ones5. Insert the Battery card slot back6. Tuck the speaker into the silicone shell.