Fosmon 113dB Bike Alarm — Compact IP65 Waterproof Anti-Theft Siren with Remote & Tilt SOS

Fosmon’s 113dB bike alarm is a compact, weather-resistant anti-theft and SOS system that detects vibration or tilt and emits a loud siren controllable by remote.

This small but powerful alarm uses a multi-level vibration sensor and tilt detection to protect bicycles, e-bikes, scooters, motorcycles, trailers, and more. Designed for outdoor use with an IP65 rating, the unit can be surface-mounted with adhesive or secured with cable ties and brackets. It pairs with up to eight remotes, giving you flexible arming and disarming options while adding a loud audible deterrent where locks alone aren’t enough.

How does the alarm detect theft or tampering?

The unit monitors movement through an adjustable vibration sensor and a tilt-triggered SOS mode. When armed, any vibration above the chosen sensitivity level sets off the siren; a tilt beyond 45° initiates a distinct SOS signal to alert bystanders.

• Seven sensitivity levels to match location and mounting surface
• Three volume settings to adapt to urban or quieter environments
• Tilt-detection SOS mode for accidents or rollovers

Will it stand up to weather and rough outdoor use?

The Fosmon alarm is built with an IP65-rated enclosure to resist water spray and dust intrusion, making it suitable for exposed bikes and scooters. It’s compact and securely fastens with included hardware so it won’t rattle loose during normal rides.

• IP65 protection against rain and road spray
• Multiple mounting options: adhesive pad, cable ties, or brackets
• Durable housing designed for outdoor installation

How easy is installation and day-to-day use?

Setup is straightforward: choose a mounting spot, clean the surface, then attach the alarm using the adhesive or supplied ties/brackets. Pairing remotes is simple and the device supports multiple remotes, so families or shared vehicles can each carry a controller.

• Quick stick-on mounting or secure cable-tie installation
• Pairs with up to eight remote keyfobs for shared access
• User-adjustable sensitivity and volume for tuning to surroundings

What vehicles and locations is this alarm best suited for?

This alarm is versatile enough for a range of uses beyond bicycles: attach it to e-bikes, scooters, motorcycles, trailers, carts, or even gates and luggage to add an audible security layer. It complements physical locks and adds an immediate deterrent against opportunistic theft.

• Works on bicycles, e-bikes, motorcycles, scooters, and trailers
• Also functions as luggage, gate, or fence alarm for added versatility
• Designed to supplement—never replace—mechanical locks

Who is this for? The Fosmon 113dB bike alarm fits riders and owners who want an affordable, weather-resistant audible deterrent that’s simple to install and control. It’s a good choice for commuters, apartment residents, delivery riders, and anyone who stores a vehicle in semi-public areas and wants an extra layer of theft prevention and incident signaling.