To monitor multiple firings at a time, to know the extended period after the bell, this triple timer could be the ideal I wanted. Simple to use, it shows the time, and is fixed on a metal support by its magnetic base. Only two drawbacks: the alarm is not very powerful, and the keys are not blĂ´quables if I put the camera in my pocket so risk unwanted adjustment Solution: install or fix the camera and stay close. I am very satisfied nonetheless.