It is either a 30 60 or 60 120 Hz flicker, depending on how they built the electronics. It is 30 60 Hz if they didn’t include an inverter and 60 120 Hz if they did.
Without an inverter, it will be off for 50% of the time. With an inverter, it will always be on, but sometimes dim.
With better electronics, it will be steady on, but that’s not common in christmas lights.
Yep, you’re right. Had the 2 on the wrong side. Fixing.