How do powered, no neutral, wall lamp switches work?

[VaSe7u]

There are wall lamp switches with electronics for touch buttons and remote control that are connected in series with the lamp, like this one https://www.livoloeurope.eu/livolo-wifi-touch-light-switch-with-glass-panel-vl-c701-11.
The only explanation about their operation I found was that they use two power supplies. When the lamp is on, a step-up transformer is used, because the voltage drop on the switch is low and the current is relatively high. And when the lamp is supposed to be off - it is dimmed to complete the circuit.
I'm curious about a more detailed explanation.

[CopperCone]

the marketing with the figure skater is lol

"or something hard" i wonder what that would be

i also wonder why you would attack it with a knife or 'something hard'

incase the figure skater try to get away from you and you miss?

did they have convicts do the marketing on this shit? the violent predator has clearly been rehabilitated with prison acquired knowledge of electrical engineering 

seriously, is the scream killer or jason vorheves marketing this?

you got kissing in the first picture (im not giving any points here for the woman looking to be in charge of that maneuver since we are politically correct (fatal attraction), then a figure skater raising her leg up, then talk about knives and hard things, then scary PCB soldered brass mains contacts

hey, then when you scroll down you can even see what kind of looks like jasons hokey mask as the back cover of the PCB

i think the design time had something on their mind lol

i dunno, if you buy from that company maybe consider getting some home security upgrades

[MasterT]

The difference between this classic regulator and more advanced /modern one is only in IC sensor chip implementation. But the way it's getting power is the same, it's cut some voltage, few degree or so, before the thyristor  fires up and closed circuitry. Modern IC doesn't need much power to operate, and thyristor itself needs only short pulse of current, so there is newer 100% power at the load, but very close to it, probably 98-99%. I'm lazy to search a formula, though do yourself your homework

[tsman]

The no neutral required smart switches work by passing a very low current through the bulb to complete the circuit and power itself. This trick is from the incandescent bulb days as such a low current won't be enough to cause it to emit any light. This is why your switch mentions you may need a "Lighting Adapter" if your bulb is lower than 15W as that low current may be sufficient to charge the capacitors in the LED bulb and cause flickering. They mention this on the adapter page. Another problem is that the LED may illuminate very dimly.