Having had all sorts of timers, many of which clockwork - which usually break down in the end, this salter big button is a wizard. You can reset immediately after use, no faffing about rewinding. You can repeat the same timing, useful when turning something being cooked and requiring attention at regular intervals. The battery does have to keep going all of the time, but that is just like a watch. The buzzer is very hight pitched and insistent but never obtrusive, it can be heard easily over a high level of general background noise. An invaluable kitchen tool.