Battery Type:2pcs AAA
The black button is main button to operate the horn.The red button changes sound only.Please find the black button at end of curly wire that attaches seprately to handlebar.
Compatible with all bikes including road bikes. 6 kinds of sound effects.Extremely loud & clear sound.
If you ride your bike on busy main roads, make sure people can hear you coming with this super loud electronic bike horn.
Very easy to install on any bike handle bar
Super loud--up to 110 dB ,loud enough to get the car and the trucks drivers' attention.