Hello Duane M Reese,
Thanks for writing in.
The left one is high voltage alarm, the right one is low votlage alarm.
From hight voltage value to low voltage value, there are 6 digits of number, you can short press button to increase them. Without button operation for over 3 seconds, it will switch to next digit.
After setting, please keep pressing button until it show” PASS”.
Hope this can help you.
Best regards.