Making that Buzzer Ring

摘要

In some retailers, it is a pressure-sensing device under the floor mat near the entrance. For others, it is an electric beam that gets broken by passing legs. Sophisticated retailers use cameras with integrated motion sensors. But whatever the scenario, the ear-perking "ding-dong" is the first step in making the cash register go cha-ching. The problem 12-volt retailers face is driving store traffic, but our most effective weapon against Internet sales is an in-car demonstration. So we need to make that buzzer buzz-consistently.