Key Features:
Recognizes & reports smoke and CO signals from interconnected detectors.
Built-in signal repeater for a stable Z-Wave mesh network.
Long Range & 800 series chip: fast, reliable communication.
Optional 120V relay to control lights or sirens.
SmartStart & S2 security for a truly smart home. Upgrade your safety and savings this week at The Smartest House!
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We have one of these on our hard-wired smoke detectors at our house. Works great!
Since the box is labeled, “DC signal sensor,” I’ve always wondered what other applications work with this device? 
Nice catch! When we originally released the device, we were able to use it to monitor 6-9V in some situations; however, in real-world testing it was quite limited. The sensor has been rebranded to no longer include the “DC Signal Sensor” language and is instead specifically a Smoke & CO Detector Bridge.
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Mine goes off line about once a month. I have to climb up on a step ladder, press the button three times. Then I have to add a device in SmartThings. Moments later the device is back on line. It’s a little scary when I am out of town and see it’s off line and know there is nothing I can do until I get home.
Can you please let us know what firmware the device is running in order to better assist?
ZEN55 firmware version is 1.2.
The just received a notification from SmartThings that my ZEN55 is offline. I happen to be in the room where the detector with the ZEN55 is connected and the light on the detector shows power.
Thanks for those details! There is a firmware update that fully resolves the issue (you can check each device change log for updates and bug fixes). Do you have access to a windows computer and a Z-Wave stick to complete the update? Unfortunately, SmartThings is one of the only hubs on the market that does not support direct Z-Wave device firmware updates.
I have a windows computer, but I do not have a zwave stick. Where can I get a zwave stick?
J. Vern Stover Jr.
520-730-6449
I just found your 800 series stick on Amazon. Is that what I need to update the firmware?
J. Vern Stover Jr.
520-730-6449
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Yes, you can use any version Z-Wave stick to perform the update. You can access firmware files directly in our Knowledge Base.
Here are the OTA update instructions for our products.
If your hub doesn’t support OTA updates and you don’t have a Z-Wave stick, you can purchase one here with a $10 discount using code: OTA10 . The code will work for either New or Open Box version (all open box devices are pre-tested and covered under warranty).
Please let us know if you have any questions about the process.
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Thank you. Using the link and the discount code you provided, I have a stick ordered. I appreciate your time and quick response.
My pleasure! Please let us know if you have any questions!
I realize that the ZST10 S2 stick is for advanced users, and I am not an advanced user. Any possible way you can assist me in setting it up on my windows 11 laptop? Minimally I need to be able to update the firmware on my Zooz devices while not removing them from my SmartThings hub. Thank you
Hi @AZNative! Unfortunately, the best way to think of the PC Controller software is as another hub. In order to update the firmware, you need to exclude the device you want to update from SmartThings, and include it to the PC Controller software in order to update. If you’d like to reach out to our team directly, we’re happy to assist with the software set-up and the update process.
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Having updated a number of devices–mostly Zooz, but also Aeotec–that formerly were on a SmartThings hub (since moved to a Z-Box, which I like very much), I can say the process it fairly easy once you’ve done it a few times.
Devices that are being controlled by or appear in SmartThings Routines will show up in each routine as missing, so you just need to edit the Routine after re-joining the device to the SmartThings hub.
Hint: before removing the device from SmartThings for updating, click on the device, select Routines at the bottom of the app, and make a note what Routines use that device. Just a screenshot or a sticky note are good ways to remember which Routines to update.
Setup of the software is fairly straight forward. You’ll need a PC with a spare USB port to take the Z-Wave stick. The software I used, Silicon Labs Simplicity Studio, might appear overwhelming! It is designed for developers, i.e., those propeller heads that make all of the Z-Wave devices. 
But don’t panic: you only uses a very small subset of its functionality and, once you do it, it becomes very easy and straight forward!
One more thing: some devices update more quickly than others. But the software shows update progress, so you can keep an eye on how it is going. And it might be useful to use a laptop, if available, and locate it near the device to be updated to provide a strong Z-Wave signal. Some of my (older) devices were more fussy about this.
Good Luck!
Barkis,
Thanks for responding. I appreciate your recommendations I can get here, then I have no idea what to do next. 
Can you help?
Hi @AZNative! It looks like you’re on step 7 of our instructions. You can continue with the instructions, and I’ve copied them below as well:
- Click on Settings (the gear icon in the top right corner)
- Check the recognized USB controller on the list in the dialog window. If there’s nothing there, click DETECT and then REFRESH. If the USB stick still doesn’t show up, you may need to install special drivers so please contact the manufacturer of the device for instructions.
- Click on Network Management
- Click on ADD to enroll the controller in inclusion mode, then activate your Z-Wave device the same way you did when adding it to your hub (see device manual or online instructions for device specific pairing / inclusion steps)
- Once the device is successfully included, please select and check it in the dialog window on the left. Then click on the OTA firmware icon (arrow pointing up) in the side menu:
- Wake the Zooz device up if it’s battery-powered (see device manual for wake-up instructions) then select and check it in the new dialog window. You need to be able to see the current firmware version displayed in the upper part of the dialog window. The click on GET.
- The folder icon will become active - click on it and locate the OTA firmware file, select, and open it.
- Once the name of the file name appears next to the folder icon, click on UPDATE and wait for the process to be completed. Progress bar will display on the bottom of the screen, followed by a “Success” or “Completed” message. If you notice an error about the wrong fragment size, please change the fragment size to 20 before attempting the update again.
- Go back to main menu and click on Network Management again.
- Click on REMOVE to exclude your Z-Wave devices the same way you did when removing it from your hub (see device manual or online instructions for device specific exclusion / removal steps)
- Add the Zooz device back to your hub.
Sara, Thank you! That did it, I think. After getting it re-added to SmartThings, I don’t see the firmware version. Am I missing it? See Attached.
I needed to reinstall the edge driver. The device firmware is at 1.3 now. Thank you for all your help and for letting me highjack your ZEN55 Promotion. I should have gone directly to support.