The PM&4HR indicator basically shows you a bunch of important price levels on your chart:
Premarket Levels:
Premarket High
Premarket Low
Premarket Median (middle point between high and low)
4-Hour Levels:
Current 4-hour High
Current 4-hour Low
Previous 4-hour High
Previous 4-hour Low
It calculates these levels and draws lines on your chart for each one. on any time frame The pre-market levels are only calculated during the pre-market hours (4:00 AM to 9:30 AM), but they stay on the chart even after the market opens. They'll stick around during after-hours trading too, only disappearing when the next pre-market session starts.
The 4-hour levels update every 4 hours, giving you an idea of the recent price range.
Each line has a label that tells you what it is (like "PM High" or "Current 4H Low").
You can turn each line on or off if you don't want to see all of them.
You can also change the colors of the lines to whatever you want.
The idea is to help you see important price levels at a glance, which might be useful for finding entry or exit points for trades, or just understanding where the price has been recently.