These are not worth $40. But if you catch them on clearance for $8, they're a decent upgrade over 433 MHz sensors. They're very small, super thin, but come with a strong magnet. I broke one of the clips that holds the CR2032 cell down just trying to replace it -- they're super flimsy -- but I was able to tape it in place. It still took a lot of wiggling around to make good contact and actually power up.

SmartStart pairing with S2 authentication was quick and easy with Home Assistant, zwave-js, and an Aeotec Gen 5 hub. I didn't try conventional inclusion, which other reviewers and online commenters had a lot of trouble with.

I bought two of these. One works perfectly. The other one, I'm still trying to get reliable signaling from. I paired them a few feet from the Z-Wave hub, but installed them a hop or two away. One is successfully routing through an adjacent switch, but the other is still trying to talk directly to the hub.

Use a coin to open the sensor if necessary. A screwdriver isn't quite right for the slot.

Thought I would give thease a shot but they will not pair with SmartThing and the Edge drivers. I bought 3 and only one would even pair and it came in as a on/off switch on the IDE side.

couldn't get it to pair. Junk. Don't bother.

I couldn?t get any of three paired and the tech support was non existent. Not worth the price.

I have a smarthings hub that is at least 10 yrs old and it works great. Once you figure out how to pair it. In smarthings select add device by brand, select Z-Wave then Generic Z-Wave Device then start. You now have 10sec to add the battery (+ up), put the back on and set it down. Smarthings will prompt you to scan for a QR code or enter it manually ( the code is inside the device or on a piece of paper inside the box) if it finds the device you will be asked rename it and save your changes.

This should work also

In smarthings select "Scan QR code", follow the prompts so that smarthings is searching for the device.... Add the battery to the device ( you only have 10sec to add the battery (+ up) and put the back on and set it down).
if smarthings finds the device will be asked to rename it and save your changes.

After having a bunch of issues pairing my first one with a Hubitat Elevation C7 (I'm using it as a Z-Wave bridge to my HomeAssistant VM installation).... I cribbed some Z-Wave pairing instructions together for another product, from another site, and this method JustWorks (at least, with Hubitat):
Unpack everything. Have sensor, rear cover, battery, and contact magnet ready. in Hubitat's SmartStart, scan QR code. Once accepted, name the sensor in hand, hit Save. Install battery in sensor - and, now, you need to work fast, as it's in initial pairing mode. You have 10 seconds to get the rear cover snapped on. Tap the contact magnet 3x against the arrow (light will blink each time), and PUT IT DOWN. Z-Wave link procedure may take up to 10 minutes.
Once it shows up in your Devices list (and, for funsies, it'll show up as a Ring Security Keypad G2), click the device, and change the 'device type' (drop-down menu) to "generic Z-Wave Plus Contact Sensor", assign it to a room (if desired), and click Save Device.

For you HomeAssistant users, who also bridge Z-Wave with Hubitat:, do NOT allow Maker to publish the sensor until you've changed it from 'keypad' to 'contact sensor', lest ye have multiple orphaned entities.

Was it easy? No. But, once I figured out the 'flow' to these (for Hubitat, anyways), subsequent sensors were easy to link up. And, then I ordered another 15 of them (for my windows.)

Does not connect to SmartThings. No customer support. Had to return.

Problems:
* LED blinks once when battery is put in. Once you put the back on the case you can no longer see the LED to get feedback
* QR Code to help with installation doesn't work. It's not even a URL
* Will not pair with Z Wave controller after following instructions

Should have looked at reviews before purchasing because this is going into the trash.

New 700 Series Door/Windows sensors will not INCLUDE on either of the two Hubs with any of three USB Z-Wave+ adapters. Fresh batteries, EXCLUDING and re-INCLUDING, and factory reset per Manufactures instructions - - DON'T WORK. Support won't even return requests for assistance. Monoprice will wait until after return period expires before refusing to refund. There are much better products available from other distributors.

Incredibly inconsistent. Totally unable to rely on it for automations or security.