Fosmon 113dB Bike Alarm with Remote — IP65 Waterproof Vibration Sensor, SOS Tilt Alert

Fosmon's 113dB Bike Alarm is a compact, weatherproof vibration and tilt sensor system with an SOS feature and remote control to deter theft and alert you to impacts.

Designed for bicycles, e-bikes, scooters, motorcycles, trailers and more, this alarm combines a powerful 113dB siren with adjustable sensitivity and volume settings so you can tailor protection to your ride and surroundings. The unit is IP65-rated for splash resistance and mounts easily with adhesive or included hardware. A dedicated SOS mode detects significant tilting and emits a beeping alert intended to draw attention after a crash or major tip-over.

How loud is this alarm and will it scare off a thief?

The alarm produces a 113dB siren at peak, loud enough to attract nearby attention and make a theft attempt more noticeable. It also offers three volume levels to suit urban or quieter environments and can be paired with remote control for quick arming or disarming.

• 113dB peak siren to draw attention
• Three adjustable volume settings for situational control
• Remote fob operation for immediate activation/deactivation

How does the vibration and SOS detection work?

The alarm monitors motion through a vibration sensor with seven sensitivity levels so you can reduce false triggers from passing traffic or increase detection for exposed storage. The SOS function activates when the unit tilts more than 45°, making a repetitive beeping pattern designed to signal an accident or tip-over.

• Seven sensitivity levels to fine-tune motion detection
• SOS tilt alert triggers after a 45° change in position
• Selectable settings help avoid nuisance alarms

How do you mount and operate the Fosmon bike alarm?

Installation is straightforward: clean the chosen surface, attach with the heavy-duty adhesive pad or use the included cable ties and brackets for a more permanent fit. One alarm can pair with up to eight remotes for family use, and basic operation (arm, disarm, SOS) is managed from the compact fob or the unit itself.

• Mounting options: adhesive pad or cable ties with brackets
• Pairs with up to eight remote fobs for shared access
• Simple arm/disarm/SOS controls on remote and unit

Is this alarm durable enough for outdoor use and varied vehicles?

The enclosure carries an IP65 rating for protection against rain and splashes, suitable for everyday outdoor exposure on bikes and scooters. Its compact form factor and versatile mounting make it appropriate for luggage, trailers, fences or additional security alongside a lock.

• IP65 splash-resistant housing for outdoor conditions
• Compact, lightweight design fits many vehicles and objects
• Works as auxiliary security with locks and chains

Who is this for: Riders, commuters, and owners of outdoor gear who want a simple, configurable theft deterrent and alert system. It's a good choice for people who need a loud, weather-resistant alarm that’s easy to install, adjustable for sensitivity, and usable across bikes, e-bikes, scooters, motorcycles, trailers, or even luggage and gates. For long-term support, the product includes a limited lifetime warranty—see Fosmon for details.