Classtools Countdown Timer has two slick features. You can create and set multiple timers on the same page. This means that if you had students sharing in rapid succession you wouldn't have to reset the timer for each student, you simply move onto using the next timer on the page. The screenshot below explains that feature.
The second feature of note in the Classtools Countdown Timer is the option to add music to your timers. You can have your countdown timers set to music. Mission Impossible, The Apprentice, and Countdown are the standard music options. You can add other music by using the YouTube search tool built into the timer .