Fosmon 113db Bike Alarm with Remote, Motion Sensor Bicycle SOS Alarm, IP65 Waterproof Anti Theft Alarm System, Wireless Siren for E-Bike, Motorcycle, Scooter, Cart, Trailer

What It Is

The Fosmon 113db Bike Alarm is a wireless, motion-triggered anti-theft siren with a remote control, designed for bicycles, e-bikes, motorcycles, scooters, carts, and trailers. It detects movement or tilt and sounds a 113-decibel alarm to deter thieves, plus includes an SOS panic button.

Fitment & Compatibility

Before buying, check these:

• Mounting space: The alarm unit is compact (approx. 3.5 x 2 x 1.5 inches). Ensure you have a flat, clean surface on the frame, handlebars, or under the seat—avoid curved or heavily obstructed areas.
• Power source: Requires 3 AAA batteries (not included). No hardwiring needed, so it works on any 12V or non-powered vehicle.
• Remote range: The remote works up to 500 feet in open air. Walls or metal frames may reduce range.
• Weather exposure: IP65 rated, so it resists rain and dust. Not submersible—keep it out of direct spray from pressure washers.
• Universal fit: No brand or model restrictions. Works on any bike, scooter, or cart with a solid mounting point.

Key Things to Know

• Installation: Simple—mount with included straps or screws (drilling may be needed for permanent install). Takes 5–10 minutes. No wiring or tools required for basic strap mount.
• Sensitivity: Adjustable via remote. Set too high, and wind or bumps can trigger false alarms. Test after mounting.
• Battery life: With typical use, AAA batteries last 3–6 months. Low battery causes erratic behavior—replace promptly.
• Volume: 113dB is very loud—comparable to a car alarm. Not suitable for quiet neighborhoods at night unless you disable motion detection.
• Remote quirks: The remote has a panic button that can be accidentally pressed in a pocket. Keep it separate from keys to avoid nuisance alarms.

Should You Buy It

Buy this if you have a bike, scooter, or trailer parked outdoors or in shared spaces and want a cheap, loud deterrent without wiring. It’s ideal for quick installs and temporary parking. Skip it if you need a hidden alarm, long battery life, or integration with a smart home system—this is a basic, effective noisemaker, not a GPS tracker.