60 Second Interval Timer With 40 Second Rest | 1 Minute Timer - YouTube
1 Minute Interval Timer: Recurring Gong Every 60 Seconds for Workout, Yoga, Circuit Training - with 5 Sec. Countdown - song and lyrics by Torsten Abrolat | Spotify
Amazon.com: Dimco-Gray 171 Analog Interval Timer, 60 Minutes, 120 VAC : Home & Kitchen