The 50-day average tracks the medium-term trend and the 200-day average tracks the long-term trend. Traders watch them because large funds and many retail traders use the same lines, which makes them self-reinforcing levels.
Pulse asks three questions: is price above the 50-day, is price above the 200-day, and is the 50-day above the 200-day. When all three are yes, the averages are stacked in a healthy order.
A 50-day crossing above the 200-day is often called a golden cross and the reverse a death cross. They are slow signals and usually appear after much of a move has happened, so Pulse reads the state of the stack and not just the cross.