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Install single and dual smart switches

Can someone help with last post please I'm interested to know if It will work
 
Yes it will work but you won't fit it behind the switch, if I was you I'd fit it at the light if possible.
 
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It will replace this switch, as the other switch is the slave. The one way you can see I have marked feed (L) and to light (L1), the yellow wire in the Twoway 1 (L2) and the red, yellow, blue no longer used.

As to what to do about no neutral can't help with that, I used TP-Link switches that have a battery and don't need a neutral.
 
So to make this work with a smart switch which cables do I connect and use and which do I not use. These can work without a neutral cable as they have a capacitor you in stall at the light fitting
 

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So to make this work with a smart switch which cables do I connect and use and which do I not use. These can work without a neutral cable as they have a capacitor you in stall at the light fitting
You need to read the replies from earlier. Many/most smart switches do not , on their own, support 2-way switching.
To go that you need particular types. I already told you to look at litewave.
There is a possibility of using a smart phone app to do 2-way, but it’s not pretty.
Read Ericmarks long post #3 about the options. A smart bulb is the best way. IMO
 
The video @Taylortwocities shows does basic same as TP-link (Tapo) system, but requires one to supply the remote switch with power, where the Tapo uses batteries.

I have used Tapo in my own house, and the batteries last for ages, and mean no need for neutrals, and you can renew the battery without exposing any live wires.
They work without a neutral wire as they have a capacitor
This needs to be fitted to the light, not the switch. If you have room for the capacitor in the lamp, then likely have room for the relay. In theory the landing light, I showed, does not need a physical switch, there is an option for the switches to be used, but they then work on extra low voltage so must not connect to the low voltage (230 volts) supply.
 

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