electric bell, high volume loudspeaker for audio warning; 780mAH battery embedded, USB charge, long time work and standby; Plated alloy housing, not plastic, weather-proof and durable use; Comes with holder for down forward install, less occupation on handlebar; Item: Electronic Horn Function: burglary alarm Noise: Up to 125db; Sound mode: 1 mode; Control:remote control Remote control distance: 30meters Battery: -polymer 780mAH; Charging: 5V 2A Max, Android USB mini port, about 2-3 hours for full charge; Runtime: 150hrs burglary alarm status; Ingress protection: Water Splash Proof when properly installed; Bell Mount: by holder, fits tube dia: 24-40mm; Switch fits tube dia. 20-38mm; Colour:black Material:Aluminum alloy + plastic Package Contents: 1 x Bicycle horn 2 x Remote Control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.