Works great installed on my gotrax raptor E scooter great sounds several to choose fromIt has a button that can be installed close to your thumb, very convenient. Highly recommended

I recently bought another recumbent bike and didn't want to put an AirZound air horn on it because I didn't want the bulk of the AirZound's reservoir on this sleek "speed" bike. The AirZound is otherwise the best bike horn I've ever used because it is light, requires no batteries, is very loud, and its sound is not so high-pitched that car drivers ignore it.This electric horn uses two AAA batteries (not included). To install batteries, use the included screwdriver to open the battery compartment door on the bottom – that's right, they include a screwdriver but not batteries. The bracket goes around whatever horizontal tube you have handy (hopefully not too close to where your head will be when you're riding) and snugs up very tightly with the twist-ring. The horn itself slides onto the bracket. The trigger is easily wrapped around a spot reachable with a finger or thumb but be careful because the coiled cable between the horn and the trigger looks pretty flimsy; I wouldn't put them at much distance from each other, don't stretch it out too far. The red button on the top of the unit allows you to choose from among 5 different tones and patterns of sound.All the tones are pretty high-pitched but are all VERY LOUD. At a distance or through barriers (like car windows) where the volume won't be perceived as very piercing, one or two of them probably sound like bird calls so I wouldn't recommend using those. A small speaker just can't produce a sound that is both low-pitched and loud and this is why these small electric horns always produce these high-pitched sounds instead of something like the tone of the AirZound or a car horn. The tone I have selected sounds like a warning buzzer, with a little similarity to the alarm sound of a large truck backing up.I don't expect to get the attention of cars with this Hornit knockoff as easily or as well as I do with the AirZound: It's just as loud but not as low-pitched so it won't be mistaken for a car horn. But this electric horn doesn't take up the kind of space on my bike required by the AirZound's air reservoir plus the trigger can be mounted a little way from the horn instead of being permanently attached directly to the horn as is the AirZound's. I don't mind charging up the AirZound's reservoir regularly (I don't use it much but boy I'm glad I have it when I do need to use it) but for those for whom pumping air into a bottle is an annoyance or who run out of air during a single ride (I feel sorry for you, your traffic conditions must be truly horrible), then this battery-powered horn is a good alternative. Unless you're leaning on the trigger all the time, the battery should last for months, maybe a year.Be a good citizen and get yourself a little bell or squeeze-bulb horn to supplement this LOUD electric horn. Using something like this electric horn on nearby pedestrians, joggers without headphones, or other cyclists is just obnoxious and startling. Save it for dangerous situations involving motor vehicles or dummies who can't enjoy the outdoors without buds blasting noise into both ears.edit: I bought one of these a year or so ago and while this newer one is identical in every way in terms of its appearance and operation, the tone patterns are a little different. Not worse or better, just different.

1. Easy to mount.2. Meet the purpose3. Loud and different sounds alerts others

The bell I purchased for use riding on our northern Michigan non-motorized trails wasn't getting the job done. Even when it was working properly, many pedestrians (especially in groups of 3 or 4) seemingly didn't hear the bell as I approached. On several occasions one stepped sideways at the last moment into my path with literally inches to spare. This is especially dangerous for the rider who is susceptible to a bad fall if he/she tries to avoid the pedestrian under these circumstances. Unfortunately, many pedestrians don't seem to recognize the danger they are putting the rider in by such erratic last second moves.I've used the horn once thus far for my typical 10-mile ride on the non-motorized path. So, my experience is limited. I usually first sounded my bell approaching pedestrians, thinking it a more "polite" way to signal. If they didn't seem to hear, or if it was an especially hazardous situation, I than sounded the horn. Always they reacted to the horn. And since it's so loud, they reacted long before I approached/passed.The nuts and bolts: The small phillips screwdriver they enclose is for opening the battery compartment. Device takes two AAA batteries. Any small phillips driver should work. The horn takes up little space on the handlebar. It secures with a plastic strap which is tightened down by turning a plastic cap about an inch and a half diameter, The "activation button" is secured separately to the handle bar. It's at the end of a coiled wire perhaps 12-18" in length. The strap for the button looks cheap. You "lock" the strap in place by tightening it and than inserting one if its several small ridges into various cut-outs on the strap. The large red button on the horn also will sound the horn, but for some reason not as loudly. It's main function seems to be to allow you to select between a "chirping" sound and a loud steady whistle. I prefer the latter. (Some have mentioned they were able to select from several sounds. I was not. However, the two choices are adequate.)The mounting methods I've summarized are only "semi-permenant." I suspect they were designed this way so that if it looks like rain coming, you can easily remove the device. While a few "sprinkles" shouldn't hurt it, it is an electronic device, and so you probably don't want to get horn or activation button very wet.UPDATE (April 2019): I continue to be impressed by this horn. The first disappeared on me. I think it was swiped off the bike while I parked my pickup at a shopping mall with the bike chained in the back. I promptly ordered a second one and it continues to operate a year later. Great safety device. A bell is nice to have as a first warning. But this horn is indispensable IMHO. Also, sometimes our trails wind alongside busy roadways where the traffic noise will drown out a bell. So pedestrians really appreciate it when you sound the horn while approaching under heavy noise conditions. Also, I don’t bother removing it any more if rain is forecast. Seems fairly water resistant and wouldn’t be that expensive to replace anyway. If I could make one change in this it would be to add about 2 more feet to the cord that runs from the remote push button to the horn. A bit of a squeeze positioning everything exactly where I like it.

I have had problems getting people to hear every bell that I've tried. Especially people walking in groups chatting. Worse yet, people listening to music or books with ear buds. "SERIOUSLY LOUD" is no exaggeration! I have an E-bike so I already have a lot of stuff on my handlebars. One of the nice things about this device is that the button you push to activate the horn takes up almost no room and the coiled wire to the actual horn lets you put the the horn anywhere you want to - away from the hand holds. The instructions are all in Chinese but it still took only about 3 minutes to install on my bike and figure out how to use it. Nice selection of sounds but the one that sounds like a car horn probably is best. Biggest problem will be not scaring the s%$t out of pedestrians. I have left my bell on my bike and will try that first. If I use the horn I will try to use it from a distance because it is too loud to use on someone close up! The product seems to be well made and constructed but only time will tell. The value for the price is pretty ridiculous considering the disaster that you might avoid. Definitely recommend!

It is very loud, but it does not have any authentic horn sound. It is too... electronic sounding?