Not cheap and not for everyone but it’s a neat design and is useful…..

This cute little piece of kit is basically a bell fixed onto the bottom of a Bike Computer Mount. There is a clapper protruding out of the right hand side which can be reached by your thumb without taking you hands off the hoods. Check out the newer versions which have a newer style of lever than the one illustrated here and there are various options on offer. They are neat, and in shared spaces with pedestrians can be very handy. They are made by Close the Gap from the Netherlands, not cheap though, so whilst they are attractive, not everyone will be prepared to pay the price for the advantages they offer we suspect.