Smart Switch by Martin Jerry, Single Pole, Smart Home Devices That Work with Alexa, 2.4G WiFi, Need Neutral Wire, Not Dimmer

Economical and Easy to Install with Great Customer Service
I purchased the Martin Jerry Smart Switch to replace a battery-operated switch timer that actually moved the wall switch up and down – great idea but past its time. It arrived quickly and the instructions were clear. The switch itself seems well-made and the 4 wires coming from it had wire nuts attached and were clearly labeled. I had some trouble with installation, with which customer service was very helpful (the problem turned out to have nothing to do with the switch or wi-fi, just my own stupidity; it is KEY that all neutral wires in the electrical box itself – the white ones – are touching both the smart switch wire AND each other), but while I was waiting for the electrician to come and tell me that, I contacted customer service to see if they could offer any help and they responded quickly and offered to send me another switch to try out. Instead, I installed the switch in another location to make sure it was working and that I could connect it to my network and Google Home, which was a snap with the SmartLife app I use on my other smart plugs in the house, very easy!.It’s now up and running in the location I wanted it for, and I’m going to purchase another for another room.I assume it’s as easy to connect to Alexa as to the Google Home.Some tips for installation:1. although the electrician didn’t do it, I would recommend turning the power off to the switch at the breaker box to be safe, and invest in an inexpensive voltage tester just to make sure no juice is going to the wires in the box.2. the white wire from the switch goes with the white wires that are probably pushed in the back of the electrical box and aren’t usually used for a single-pole light switch. MAKE SURE THEY ARE ALL TOUCHING EACH OTHER and the wire from the switch.3. The green wire goes to the bare copper (or might be green) ground wire(s), also pushed in the back of the box.4. The black and brown wires are a bit trickier – one is the LIVE (or line) and one is the LOAD. In simplest terms, the LINE (or LIVE) wire is the one coming from the breaker box and the LOAD wire is the one going to the fixture. It’s sometimes pretty easy to tell when you look at the side of the box each wire is coming from but not always. You might need to try both.5. Turn the power back on before pushing the switch into the box and screwing it in, in case you need to swap the black/brown wires, and test the switch.6. When the switch works by pressing on it, turn the power off again and finish the installation and attach the switchplate, which snaps on.7. Use the SmartLife App to find the switch (little light on the bottom of the switch should be flashing blue) and add it to your system.DONE.

Works great, SmartThings compatible
Took a chance on these even with no reviews because I need no-neutral-required switches and these are much cheaper per-switch than alternatives, and are Zigbee rather than something proprietary (or worse, wifi). I’m really glad I did, and I just ordered 4 more.Pros:* Normal looking switch, no branding or obnoxious lights* $15-35 cheaper per-switch than almost all the competition* No proprietary app or hub, any Zigbee hub works (I use Samsung SmartThings, SmartLife is NOT REQUIRED!)* No neutral required!!! I was worried because the box doesn’t mention this, and the switch has a neutral, but I can confirm it works without it connected* Minimal packaging* Push-in wiring rather than pigtails, saves tons of space in a cramped switch boxCons:* No setup instructions in the box, ones on the web suggest an unnecessary app* No hardware or faceplateSetup is easy enough even without instructions. Just press the switch 6 times so the light blinks, add it to your hub. SmartThings didn’t set up the handler correctly so I had to log into the web interface and set the handler to “Zigbee Switch”I don’t know why the listing is promoting SmartLife so hard but I never installed it and don’t intend to, the switch works perfectly fine without it.

Successfully converted to Tasmota OTA. Applied the MJ-S01 template. Integrated in my MQTT setup + Node-RED, works like a charm! Best of both world: Martin Jerry cloud for non-technical people, able to convert to Tasmota OTA for people like me!

Wanted a 240V smart switch and this is exactly thwt

Purchased a pack of 4 installed them all, unfortunately only 2 functioned correct.I asked Amazon for 2 replacements the only option they gave is to send them all back then receive a refund then reorder another set and reinstall.I will use the tp link in the future as I have had good success with them.I tried to contact the company but never received any response.