There is a capacitor in the box that the schematic shows should be wired in series with the neutral side of the circuit. Yet the instructions state :’ Without neutral wire is installed. The yellow Capacitor components must be distributed in parallel to L and N of the lamp holder connected in L1 position (As shown in the wiring diagram)’
The diagram shows a series connection yet the instructions state parallel.
When a smart dimmer is installed in a location where no neutral is available, the dimmer/radio "steals" power from the load. When the load is OFF, the dimmer allows a small current to flow through the load. This current needs to be large enough to power the dimmer/radio but small enough to not light the controlled device.
To help this out, a capacitor will allow current to flow, some through the load and some through the capacitor. For reasons we won't discuss here, the capacitor does not consume any real power so it is the ideal component for such use.
I've NEVER seen a similar capacitor in series with any lighting system. I suspect it's a typo.
Interesting, I've not seen a "no neutral" switch only before. I guess the "touch" circuitry requires the same "leakage" current as a dimmer. Note if you have to change the bulb, with this unit connected there is some power on the bulb. Usually not an issue but good to know.
I actually bought one on Amazon, but I haven't tried it yet. I thought one of my Third reality switches, the type that goes over the top of a switch, had died and I saw this and decided to give it a try. Turned out it was the early Zigbee issues with my C8. They are still in the box.