Review on Crystal Vision Anti Theft Loud 130db Alarm Heavy Duty Bike Lock: Weather Proof, Multi Purpose Security Solution by Darnell Murphy

As for the U-lock, at least it resists the seal, but otherwise it's just as bad as your regular Walmart U-lock, albeit a little thicker. An angle grinder only needs 1 cut as there is no mechanism to lock both sides of the yoke (meaning it can rotate freely after cutting). The alarm function did not convince me. I like simplicity: no buttons or passwords. But it's just a regular vibrating alert. Something on Revain is full of cheap ones. The electronics are also housed in a simple plastic case that can be pierced in seconds to disable it. For 40€ I expect better. I'll probably send mine back.