Inexpensive smart plug (US) and other device recommendations needed for newbie

[JDRoberts]

@tuffloud1

What is the difference between the 3210-L and the 3210-L2?

New model line.

New iris contact sensor model? (-L2)

Does anyone know the difference between the two iris contact sensors for sale at lowes.com (besides the price)? The PDF manual is the same for both so maybe its just a glitch on their website? Model # 3320-L2 https://www.lowes.com/pd/Iris-Iris-Indoor-Door-And-Window-Sensor/1000301569 Model # 3320-L https://www.lowes.com/pd/Iris-Iris-Indoor-Door-And-Window-Sensor/999925302