These alarms are designed to be attached to portable devices such as bicycles, motorcycles, backpacks, basically anything you wish to protect from theft. IP55 weather resistant, 113dB loudness, including remotes, mounting straps and pads, etc. This order is for a set of two complete units. On a bicycle I would mount under the seat to protect from direct rain, etc. IP55 is water resistant, not waterproof.
https://www.amazon.com/dp/B0BSLW9L9F #Review #Alarm #Fosmon #Bike #Trailer