For $45 - I can buy 4 Sonoff ZBminis! Since my applications has 110 VAC power for the Seco-Larm then I would need to buy an additional power supply for the battery operated, contact sensor to
add more reliability to my system. Since this Seco-Larm is picking up only sidewalk visitors then it is a non-critical security warning sensor/device.
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Might also consider adding one of these to your order.... just in case 
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Cheaper is better if it works. When I find something cheap that works reliability then I buy in large quantities to save money.
Cheap and easy to solder a set of wires to each side of the switch and use as desired.
There's a handful of threads showing details of how to do this to a couple of different vendor's contacts.
Adding to this older thread on a low cost solution ($3-$6) for a Zigbee Dry Contact Input. I'm using a Water Sensor with a Remote Sensor. I cut the end of the sensor off and soldered the lead ends (note the wires are thin, like 24awg). I changed the Device Type to a Zigbee Contact Sensor and when the leads are touching the device shows closed, when not touching the device shows open.
I have one in use and it works great.
Virtually any water leak sensor that has two metal contact points is looking for a change in resistance to trigger the sensor. I clip the sensor off and take the two wires and use them as contact closure sensors for relays and such. As an example my home alarm system 12vdc output to the siren is tied to a 12vdc relay. If energized it will short the two wires giving me a "wet" trigger, HE then sends me a text to let me know that my alarm siren is active. Really inexpensive and been using them for this type of application for years successfully. Hope that helps j
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Second vote for this device. Long battery life, simple screw contact inside the case, and is easy to add/remove to Z-wave. On Amazon here.
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I use the ThirdReality zigbee water leak sensor as a dry contact sensor. Connect your switch contacts to the existing external screws and you are good to go. AA battery provides more than a year of service.
Exactly! I have boxes of stuff saving me money right now!
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Don't we all!
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Hi @bbrannon , does the TR Water Sensor make the beeping sounds though when the contact is closed? Or how did you get rid of the beeping?
For my application I want the beep. I know it cannot be disabled in the driver. I would assume you can mechanically disable/damage the siren component.
I found this in another post.
"This has been an interesting experiment.
I managed to cut the siren cables in my thirdreality leak sensor(it was an easy process), and so far the pressure mat with the sensor is working fine.
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I replaced all the WiFi WEMO light switches/dimmers, outlet plugs, WiFi smart bulbs, and a door lock with there z-wave & zigbee counterparts. Added in a few more while I was at it. The result was measurable lower power consumption, faster response times, and when I use voice control through Google integration, hearing my device was not available has ceased. The WiFi devices have their place but I outgrew them. I still have plenty devices on WiFi though. Google minis for voice control, voice announcements, music, some cameras, Nest Thermostat, and Garage door. Currently there are devices on 433Mhz, 900Mhz, and 2400Mhz.
