In the giant cycle parks near i.e. train stations in the Netherlands or other European cities it can take ages to locate your bike after it is stored there for more than half a day.
Beep is a key that helps you to trace your bicycle in a matter of seconds. The button on the key initiates beeping sounds from a simple lock when you are in a range of 10 meter from your bike. It can be used in combination with any standard metal chain and is a simple solution to a familiar annoyance for many regular bikers