PIX200 with work shift timer, external power supply, 25' bell wire, and a loud 110V bell.
You can set up to twenty ring events over a 7 day span, which is two complete shifts with no overlap. The signal durations (how long it rings) are variable, from 1 to 9 seconds. You could have a two minute warning before the end of lunch, just 1 second long. It makes a huge difference.
Includes Variable Duration Rings: Start at 8AM, 2 seconds. Break at 10. 1 second. Two minute warning at 10:08 would be 1 second. Ring to go back to work: 2 seconds.. Two minute warning before end of lunch: 1 second. Back to work at 12:30: 3 seconds. This works like magic.
Add a custom emergency ring button, see item 408 in the list above.
Capacity: Up to 8 110V Bells or Buzzers
Add more cabling and bells as needed.