Amazon.com: BTBSIGN LED Interval Timer Fitness Gym Timers Count Down/Up Stopwatch with Remote 3'' (Blue and Red)… (Two Blue and Four red) : Sports & Outdoors
30 seconds Countdown Timer / with Beep Every 10 sec 🔵 - YouTube
1 minute audio-video timer (with beeps every 1 and 10 seconds) - YouTube