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Bike Chain Lock with 110dB Alarm - 3.94FT Heavy Duty Anti-Theft Bicycle Chain Lock with 3 Keys,IP65 Waterproof Adjustable Volume Alarm for Bicycle, Motorcycle, Scooter, Door, Warehouse, Fence (Black)

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$69.99

$ 33 .99 $33.99

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About this item

  • 1. [Dual Anti-Theft Design]: LEYMENCOJ Bike Chain Lock +110DB anti-theft bike alarm, this is the latest style upgraded to a two in one design in 2025. It consists of a 0.236"/6mm ultra thick and 3.94FT (120cm) length chain and an adjustable 110DB alarm, which can deter thieves before the chain is cut, double protect your property, and achieve better anti-theft effect.
  • 2. [High Material Iron Chain]: The electric scooter lock is made of high-quality rust proof metal, which better prevents cutting and prying. It also comes with a scratch resistant canvas cover, and helps prevent scratching and wear with your bicycle.
  • 3. [Personalized Settings]: Bike locks heavy duty anti theft bike alarm has more user-friendly settings, designed with 2 levels of sensitivity and 3 levels of volume. You can adjust it to the effect you want according to environmental factors. Rechargeable Alarm has a hard metal shell on the outside, which is anti fall and anti pressure, sturdy and durable. The interior adopts a glue filling process, which meets the IP65 waterproof standard and is not afraid of rain and snow weather.
  • 4. [Widely Applicable]: Bike lock with alarm are equipped with electronic anti-theft devices that detect movement and vibration. When accidentally touched, a reminder will sound, and when moved again, bicycle alarm will sound for 20 seconds, deterring thieves and effectively protecting your bicycles, electric bicycles, motorcycles. They can also be applied to ladders, lawn mowers, gates, fences, toolboxes, sports equipment, etc., better protecting your property.
  • 5. [Product Details] :The LEYMENCOJ alarm chain lock has passed FCC ID certification: 2BOFO-TS-BJQ03, packaged with: 1 bicycle lock alarm, 3 keys, 2 control devices, 1 silicone cover, 1 storage bag, and 1 USB-C charging cable.



Product Description

Bike Chain Lock with 110dB Alarm
Bike Chain Lock with 110dB Alarm
Bike Chain Lock with 110dB Alarm
Bike Chain Lock with 110dB Alarm
Bike Chain Lock with 110dB Alarm
Bike Chain Lock with 110dB Alarm
Bike Chain Lock with 110dB Alarm

K. David Maxwell
Reviewed in the United States on March 9, 2025
This bike lock with an alarm has been a game-changer for my bike security. One of the standout features is the three adjustable volume levels for the alarm. Whether I’m in a noisy urban area or a quiet neighborhood, I can easily set the volume to match the environment. The loudest setting is perfect for high-traffic areas, while the lower levels are great for more peaceful settings, reducing unnecessary noise.The lock itself feels sturdy and well-made, and the alarm is highly sensitive to any tampering. It’s been incredibly reliable so far, and I love the peace of mind it gives me when I leave my bike unattended.
Julie C. Gatto
Reviewed in the United States on March 8, 2025
I recently purchased this bike lock with an alarm, and I’m really impressed with its features. The 1.2-meter length is perfect for securing my bike to various poles and racks, giving me plenty of flexibility. The IP65 waterproof rating is a huge plus, as I don’t have to worry about rain or splashes damaging the lock.The build quality feels solid and durable, giving me confidence that it can withstand attempts to cut or break it. What I love most is the adjustable two-level alarm sensitivity. I can set it to a lower sensitivity for crowded areas to avoid false alarms, or crank it up to high sensitivity for extra security in quieter spots. The alarm itself is loud and attention-grabbing, which is exactly what I need to deter thieves.Overall, this bike lock is a fantastic combination of security, durability, and smart features. Highly recommend it to anyone looking for reliable bike protection!
Kelly Driscoll-Smith
Reviewed in the United States on March 8, 2025
The lock itself is sturdy and reliable, but the 110-decibel alarm is what truly sets it apart. The moment someone tries to tamper with my bike, the alarm goes off instantly—loud enough to scare off any thief and alert everyone nearby.The setup was quick and easy, and the lock fits perfectly on my bike without being bulky. The peace of mind it provides is priceless, especially when I have to leave my bike in public areas. It’s a brilliant combination of physical security and smart alarm technology.This 2-in-1 alarm lock is a fantastic investment. Highly recommend it to all cyclists!
John Moore
Reviewed in the United States on March 2, 2025
Super heavy duty. I'm not sure if I would give this to a kiddo though as it weighs a lot and would be awkward for them to carry or ride with. Comes with keys and cord to charge. Always lock your bike through the frame and front tire so someone can't easily take your bike and just leave the tire.