Is it necessary to replace both switches in a 3-way circuit with smart wireless switches?

In response to DamanicGar asking about having a 4 way. It shouldn’t make a difference. When you have a 4 way , there is a 3 way wired before it on the line side and after it on the load side(light side). You can have infinite amount of 4 ways in between the 2- 3 ways. So your smart switch could go on the line side- power from the panel hits the switch, 2 traveler wires leave the 3 way and go to the 4 way, 2 traveler wires leave the 4 way and go to the last 3 way and then the load wire on the black terminal goes to the light. ( neutral wires are just wirenutted through and not switched). The smart switch can also go on the load side 3 way. Having a 4 way in the middle doesn’t make a difference. There is always power on the line side 3 way and there is always power at the load side 3 way( power alternates which traveler wire it is on depending on the position of the other switches). All that to say, the smart switch would not even know that there is a 4 way even there. All the 4 way is doing is switching which traveler has power going to the load 3 way.

Can the switches still be used manually--without Alexa or the Kasa app once set up?

Yes - you can simply press the physical switch on the device to manually turn the lights on or off. Regards, TP-Link Support

can these use standard decora wall plates?

Yes, you can. I don’t know why people have had issues, but I have installed dozens of various Kasa switches and always use third party decorator plates. They have always sat flush against the sheet rock. If there is a gap, you are either not using flat headed screws to attach the switch, or it’s not installed all of the way.

this comes with 2 switches. Can i use this on 2 different sets of lights? such as the front porch and the back porch independently of each other.

You ever get the one 3-way switch to work? I tried and can't seem to get it to work with only 1 switch installed. I have power and I when I switch the light off with my phone I can hear a click in the switch, but the lights do not turn on or off. During the installation process the final steps walk through a process to pair the 2 switches. I just "nexted" through the pairing steps. Not sure if it not working because it is not paired with the other switch.

Manufacturer	TP-Link
Part number	HS210 KIT
Item Weight	314 g
Product Dimensions	12.95 x 7.01 x 16 cm; 314.34 g
Item model number	HS210 KIT
Size	2 Pack
Color	Original Version
Style	3-way
Material	Polycarbonate
Pattern	Smart Switch
Shape	Rectangular
Voltage	120 Volts
Wattage	1.8E+3
Item Package Quantity	1
Switch Type	3-way
Plug Profile	Wall Mount
Switch Style	Toggle
Specification met	UL
Special Features	Dimmable
Included components	Qty 2 - HS210, 2 Wall Plates, 4 Mounting Screws, 4 Wire Nuts, Quick Start Guide
Battery Cell Type	Lithium

3 Way Switch HS210 KIT, Needs Neutral Wire, 2.4GHz Wi-Fi Light Switch works with Alexa and Google Home, UL Certified, No Hub Required, White,2 Count (Pack of 1)

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