Bicycle theft is still one of the most common crimes in Germany. Several 100,000 bicycles are stolen every year. The thieves often manage to steal the stolen goods within a few seconds. It is particularly annoying when the thieves tamper with the expensive e-bike or newly acquired mountain bike. It is therefore imperative to defend yourself effectively against it. Alarm locks are a good way to do this. If someone tampered with it without authorization, a high-pitched alarm tone is emitted, which scares off the thief and draws the attention of passers-by. This minimizes the risk of theft and optimally protects your bike.