This is pretty cool! Was just shared with me by a friend and I thought it could be handy for electric bikes. The "Loud Bicycle Horn" combines two notes to sound like a car's horn and it mounts on the downtube near the front of the bike using bolts (may not work with all bike designs).
	
		
	
	
		
			
		
		
	
				
			- Water resistant, you can use it in the rain
 - Loudness: 112 Decibels, like a typical car horn
 - Pitch: Just like a compact car, low tone ~420 Hz,
high tone ~500 Hz - Honk duration: up to 30 seconds straight, but please be respectful
 - Batteries: Mini USB rechargeable, lithium batteries that will last 1-2 months
 - Dimensions: 6x4.5x4 inches at its widest extent
 - Weight: Less than 23 ounces
 
