1 19

120DB Bike Horn Alarm - USB Rechargeable Electronic Bicycle Bell for Cycling Safety and Loud Road Warning Alerts

120DB Bike Horn Alarm - USB Rechargeable Electronic Bicycle Bell for Cycling Safety and Loud Road Warning Alerts

$34.99
$69.98 $34.99
Sale Sold out
Shipping calculated at checkout.

A thumb-flick, and the car actually hears you

A ping from a chrome bell dies about four feet from your front wheel. Inside a car with the windows up and the radio on, it does not exist. That is the whole problem with the bell you have: it is polite, and polite is not what you need when a door is about to open into the lane.

This is an electronic horn instead. It straps to the bar next to your grip, sits under your thumb, and makes an electronic tone rather than a mechanical ding. You never take a hand off the bar to use it.

It is small — about the length of your thumb — and it recharges over USB, so there is no battery hatch and no coin cells to find.

A rider's thumb pressing the button pad of a small black bicycle horn strapped beside the grip

About the decibel number

The manufacturer rates this horn at 120 dB. We are going to be straight with you about what that figure is and is not worth.

A decibel reading only means something if you say how far from the speaker it was measured — the same horn measures far higher at an inch than at a metre. No measuring distance is published with this rating, by our supplier or by anyone else selling this style of horn, so there is no way to check it and no way for us to stand behind it as a tested measurement. Treat 120 dB as the category rating it is.

What we can tell you honestly is the practical part: it is an electronic siren tone, not a bell, and it is loud in the way a car horn is loud rather than the way a bicycle bell is loud. That is the reason to buy it.

Close detail of the horn's control panel, four rubber buttons around a centre button with two small indicator lenses

Please use it like it is loud

Sound at this level is not harmless. Around 120 dB is where noise stops being merely loud and starts being physically uncomfortable, and repeated close-range exposure at that level can damage hearing. The horn sits about an arm's length from your own ears.

  • Short bursts. Tap it. Do not hold the button down, and do not sound it repeatedly for fun.
  • Never near an ear. Not yours, not a passenger's, not a pedestrian's, and never as a prank. Aim the speaker face forward, down the road.
  • Test it away from your head. The first time you press it, have it at arm's length and pointing away.
  • Read the room on shared paths. On a quiet towpath a person walking a dog two metres away does not need a car-horn tone. Use your voice; save this for traffic.
  • Keep it away from small children. It is a loud siren in a palm-sized package and it is not a toy.

How it fits

There are no bolts and no clamp band. A flexible silicone strap threads through a lug under the horn, stretches around your handlebar and hooks back onto the lug. It takes about a minute and no tools, and it comes off just as easily when you park somewhere you would rather not leave it.

Because the strap stretches, it suits a range of round handlebars and stems rather than one exact diameter. The supplier does not publish the range it covers, so if your bars are unusually fat — some cruiser and e-bike bars are — measure before you order.

Two hands stretching the silicone strap of a small bicycle horn around a handlebar, fitted without tools

The second mode: an alert tone for a parked bike

The horn also has an alert setting you switch on with the button pad when you walk away from the bike. It is what the word "alarm" in the name refers to.

Be clear about what that is: an audible deterrent, and nothing more. It makes a noise. It does not lock anything, it does not track anything, it does not send anything to your phone, and it will not stop a determined thief — the horn itself unstraps in seconds. Use it the way you would use a noise: as one more reason for someone to pick a different bike, on top of a proper lock, never instead of one.

We have not been given the trigger specification, so we are not going to tell you exactly how sensitive it is or what sets it off.

A parked bicycle at a city rack with the small black horn strapped to its handlebar beside the grip

Charging, and weather

Battery250 mAh built in, charged over USB. The supplier gives about an hour and a half for a full charge.
How long a charge lastsThe supplier quotes weeks between charges. That figure assumes ordinary commuting use — how long you actually get depends entirely on how often you sound it, and the alert mode will drain it faster.
RainIt is sealed to live on the handlebar and shrug off rain and road spray. No IP rating is published for it, so we are not going to give it one. Do not submerge it, do not pressure-wash it, and bring it in if the bike is going to sit out in weather for weeks.

Specifications

What it isA USB-rechargeable electronic bicycle horn with a handlebar strap mount and a parked-bike alert mode
Rated output120 dB (manufacturer's rating; no measuring distance published)
Size2.6 in tall x 1.4 in wide (6.5 x 3.5 cm)
WeightAbout 1.2 oz (33 g)
MaterialABS plastic body, silicone mounting strap
ColourBlack
ControlsA four-way button pad around a centre button, with two indicator lenses
MountStretch silicone strap, 2.7 x 1.0 in (6.8 x 2.5 cm), tool-free, for round handlebars and stems
In the boxThe horn and one silicone strap. The supplier's own paperwork disagrees about whether a charging cable is included, so plan on using a USB cable you already have.

What we cannot tell you

This product is new on the site and has no reviews yet, so there is no owner experience to draw on either. Where we do not know something, we would rather say so.

  • A verified loudness figure. No measuring distance is published with the rating, and we have not measured one ourselves.
  • An ingress rating. There is no IP number for this horn. "Fine in the rain" is what the supplier describes; it is not a tested seal class.
  • The exact number of sound modes, or the alert trigger. The button pad clearly switches between settings, but we have no specification listing them.
  • The handlebar diameter range. Not published. The strap stretches, but measure your bars if they are unusually thick.
  • Which USB connector it uses. The supplier's text says micro-USB. We have not confirmed it against a unit, so do not throw away your old cables yet.
View full details