

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.
🚨 Stay a step ahead—secure your ride with Fosmon’s fierce 113dB shield!
The Fosmon 113dB Bike Alarm is a compact, IP65 waterproof anti-theft system featuring a powerful 113-decibel siren triggered by vibration or movement. It includes a wireless remote control supporting up to 8 remotes, adjustable sensitivity and volume levels, and an SOS tilt alert for accidents. Designed for bikes, e-bikes, scooters, motorcycles, and more, it offers easy installation and a limited lifetime warranty, delivering robust, versatile security for your valuable ride.







| ASIN | B07PQ92SHC |
| Audible Noise | 113 Decibels |
| Best Sellers Rank | #30,821 in Automotive ( See Top 100 in Automotive ) #9 in Antitheft Alarm Systems |
| Brand | Fosmon |
| Compatible Devices | bicycles, e-bikes, scooters, motorcycles, carts, trailers |
| Customer Reviews | 4.5 out of 5 stars 7,235 Reviews |
| Global Trade Identification Number | 00879565005795 |
| Includes Remote | Yes |
| Item Weight | 4 Ounces |
| Manufacturer | Fosmon |
| Maximum Range | 90 Feet |
| Mfr Part Number | 51087HOM |
| Model Number | 51087HOM |
| Noise Level | 113 Decibels |
| Remote Control Included? | Yes |
| UPC | 879565005795 |
| Unit Count | 1 Count |
R**N
Great touring bike alarm!
Effective, easy to use alarm for my touring bike. Really loud! Just have to remember to disarm it when you return!!! Used it during a solo coast-to-coast cycling tour across the U.S.
M**Y
Loud, Reliable & Perfect for My E-Bike
I attached this alarm to my electric bike, and it has quickly become an essential part of my security setup. Installation was fast and easy, and once in place, it feels secure and well-built. The alarm is seriously loud — the kind of sound that turns heads instantly and makes anyone think twice about tampering with your bike. I feel much more confident leaving my bike outside now, whether I’m running errands or stopping somewhere for longer periods. I use it alongside my lock for double protection, and the combination really gives me peace of mind. Compact, easy to use, and highly effective — this is a must-have for any cyclist.
P**E
A Must-Have Security Upgrade for My Electric Scooter
I recently added this remote-controlled alarm to my electric scooter, and I couldn’t be happier with the results. As someone who relies on my scooter for daily transportation, I’m always concerned about theft, especially when locking it up at a bike rack in public. This alarm has given me so much peace of mind. Durable and Well-Built The alarm feels solid and well-made. It’s compact enough to stay out of sight, but the quality of the build gives me confidence that it can withstand daily use and varying weather conditions. Powerful Alarm The sound is LOUD—exactly what you want in an alarm. If someone so much as nudges the scooter, it triggers a piercing alert that would scare off any would-be thief and draw immediate attention. Easy Installation The installation process was straightforward. It comes with everything you need to attach it securely, and the instructions were clear. I had it set up in less than 10 minutes. Convenient Remote Control The remote control is a game changer. It’s small enough to carry on my keychain and has a good range, so I can activate or deactivate the alarm without having to be right next to the scooter. The remote also feels sturdy and well-designed. Added Security Layer While I always lock up my scooter with a quality U-lock, this alarm adds a crucial extra layer of security. Knowing that any tampering will trigger a loud alarm makes me feel much more comfortable leaving my scooter unattended for extended periods. It’s a deterrent that could make a potential thief think twice. Battery Life The battery life has been excellent so far. I’ve been using it for a few weeks, I appreciate that it doesn’t drain quickly despite being in constant use. Overall This remote-controlled alarm has become an essential part of my scooter setup. It’s affordable, easy to use, and provides an extra layer of protection that every electric scooter owner should have. If you’re looking for a reliable, effective way to deter theft, this is it. Highly recommend!
A**M
Great alarm with small flaw
The the remote is gives a unique look, battery life is still testing wit what th company offers. The durability is solid I mean beside it being plastic I don’t think anyone is going to destroy it right then there. Alarm is at least loud for some attention. Weight is light. Bad part is one small flaw the very small screw it so easy to lose. I was literally unscrewing to get the safety plastic off to use it and placed the screw on my lap a now I can’t find it. If the device had like little safety hooks to have the lid secure like when your dissembling a console that type of safety.
J**M
Great motion sensing alarms
So I bought these for going on an overseas trip. They worked great for that. I bought 3.1 for the door and 2 for something else. I won't go into detail on that here. I only ended up using one on the door, and it worked great. The things are loud as hell. I had 2 programmed to 1 remote and 1 on it's own. An unforeseen use came up at home as well. My dog loves to get into the blinds to look outside. I was worried she would mess them up. So I programmed them all to 1 remote and put them on the windowsills when I'm at work. Now she won't touch them! You can change how sensitive or how loud it is. I didn't find the need for any of that though. If you need some type of motion (vibration) sensing alarm, this is a great option.
B**N
Even for a non-standard application, this worked really well.
I used this to secure a *moving truck* while I relocated my house. I zip-tied the unit to the roll-up door, high enough off the bottom that it couldn't be reached without opening the door, but low enough that it didn't impede the operation of the door. Your mileage may vary in this, but ultimately you would want to mount the unit somewhere where it can detect the vibrations of the door moving. When we reached our rest stop for the night, I checked the load, locked up the truck, and engaged the alarm. A quick shake of the door found that anyone messing with the door would trigger the alarm. And lest you think it wasn't loud enough inside the box of a box truck, I can assure you that it was. I was afraid to test it at the hotel because I was afraid of disturbing the guests. I had no worries at all about it being loud enough. It definitely would have scared off a would-be thief. What a great find.
J**N
Good Enough For Me
I live part-time in my van. I put this on my generator when I’m out camping. I use the generator to charge up my power stations when there’s insufficient sun for solar charging them. Even though my generator is chained to my vehicle when outside, this gives me an extra measure of confidence against theft when I’m temporarily away from my campsite. The alarm is loud enough and annoying enough for my purposes.
G**O
Not as loud as I thought
Not as loud as I thought
S**Y
Fonctionne assez bien. Alarme assez forte.
Fonctionne assez bien
P**N
Preis-Leistung top!
Ich finde diese kleine Alarmanlage toll. Sie ist selbst für den Laien schnell montiert und verrichtet zuverlässig ihren Dienst. Ich musste sie erst nach ca 3 Monaten wieder aufladen,was ich völlig OK finde. Lediglich der Ein und Ausschalten finde ich zu laut.
P**A
Accurate representation
It does what it’s supposed to do
J**A
Satisfecho con el producto
Excelente producto
P**2
Rempli sa fonction dissuasive
C'est le deuxième que j'achète. Très bien et très sonore
Trustpilot
1 month ago
1 month ago