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Welcome to your Simtek Duo Wireless Security Sensor. Thank you for your purchase. Let's get you started. 

Setup in Seconds

download app

The best way to setup your sensor for the first time is to download the Simtek sensors app on the Apple app store, or the Google Play store. Search for Simtek or Simtek Sensors. 

  • Scan the QR code on the bottom of your device, or enter in the unique device id in the app setup screen (unique device id is the 16 digit number located underneath the QR code).  
  • Insert battery (ensure battery is fully charged, or your sensor won't have enough juice to transmit an alert)
  • Insert antenna (we recommend attempting to send an alert with the external antenna first, which is larger and better than the internal antenna) before removing and using only the internal antenna.)  
  • Arm your sensor by placing it in a dark and motionless space. It has to be in a dark AND motionless space. For example, if you have it in the middle of your room with the lights on it will not arm itself. If you then turn off the lights in that room, it will arm only after it detects zero human or animal heat motion. The blue light with the hand motion icon lights up every time it detects motion. Note: There is NO light detection LED that lights up. So, you won't know if your space is dark enough until you try to arm it. We recommend placing it first in a space you know is extremely dark and motionless, like a table drawer, shoebox, or even the box your Simtek sensor came in! Then, when you verify you are receiving alerts and SMS, we recommend you then move it to where you want to. 
  • Always verify you are receiving alerts first. For example, when you want to take your sensor traveling to monitor your luggage, always arm and trigger your sensor in your luggage, before leaving it in there for the day. That way, you'll feel confident it's working and can trust it. 

Turning ON/OFF

    • There's no ON or OFF button. You control this by removing or inserting the battery. 

    Using the antenna(s)

    • The external antenna is OPTIONAL. This means if you take out the external antenna, your Simtek sensor will still operate normally and send alerts! However, the internal antenna is simply not as high performing (we have the best one in there, but we're constrained on size - we didn't cheap out!)


    • The Simtek simcard is already pre-installed into the sensor. Note: it's against our TOS and policies to remove your simcard and use it for anything other than your Simtek sensor (don't remove and use in a phone, if you do this we will be alerted and take legal action when you run up a massive bill and ruin it for everyone else!)
    • Simtek simcard can be removed, and you can use a different 3g GSM enabled (sms + data required) simcard. It's located on the back of the device, left of the antenna and is a slot that requires a paper clip or similar device. You'll use a paper clip to press the white simcard in until you hear a click, and then wiggle it out. Note: we intentionally made this a very difficult process, because we don't want people taking the simcard out (even to inspect it) because if you put it in wrong, it's hard to know and you would think the device is broken. 

    Manual Setup

    Note: This option is a LAST RESORT. It's difficult and easy to mess up. And you might think something is broken, but you might have just entered a very long number incorrectly. 

    If you can't download the app or it's not working for you, you have the option to manually subscribe to your device to receive alerts using the method below. 

    1. Locate the 16 digit device number on the bottom of your device. This is under the QR code, and is NOT to be confused with the serial number. 
    2. Open up your SMS text on your phone. 
    3. In the TO field, enter the following number +1(240)303-3852
    4. In the MESSAGE field, type Add 123456789
    5. ***NOTE: Remove the quotes from step 4, and replace 123456789 with your specific device number. It should look something like this Add 0004A30B0022D311
    6. Send the text. You will receive a confirmation text reply from our server if successfully registered. 
    7. Triple check digit by digit that you have entered the device number from step 4 correctly. 
    8. Arm and trigger your sensor to see if it worked. Alerts take between 15 seconds and up to 2 minutes the first time to get an alert. Normal operation alerts should come in 10-30 seconds or less after triggering.  

    manual registration


    • I have never received an alert, and I'm subscribed to the sensor - and I triple checked that I subscribed to the right device number! Help!

    Don't panic. Typically, there is an easy to fix here. Let's run through this checklist.

    1. Fully charge the battery using the micro USB cable. 
    2. Make sure the external antenna is plugged in (at least for debugging, it is helpful to have the best signal possible). 
    3. Re-Arm your sensor in a new location. Try placing it in a different space in the house (maybe a closet, or a drawer). And make sure it's dark and fully motionless. 
    4. Did you arm it and did it trigger correctly? You'll know when your Simtek sensor is trying to connect to the network when you see the green and red LED's lighting up on the right side, just under the blue hand motion icon. When it's successful, the two colors blink for about 15-20 seconds and the red LED stays lit for a few seconds, then they both shut off immediately after transmission. If your device can't ever find signal, the green and red LEDs blink constantly and shut off after about 2 minutes of trying to connect. This should be extremely rare. 
    5. Is the simcard inserted and did you, or someone else tamper with it? We do not recommend touching or removing the simcard we have installed, as it can affect the performance if it's not inserted correctly and fully seated. 

    I was receiving alerts, but now I'm not!

    Don't panic. Typically, there is an easy to fix here. Let's run through this checklist.

    1. Do you still have a data plan with Simtek, and your phone carrier? 
    2. Did you move your device to a new location that might not have as high signal?
    3. Did you unsubscribe from alerts and/or delete the app?
    4. Did you get a new phone?


    • Remove the battery, and keep the battery separate from any metal objects (place inside a plastic bag or something similar). 
    • Both the sensor and all accessories, including the battery can go in either carry on or checked baggage, but check your country specific laws. Our team has never had any problems traveling domestically in the USA or internationally to several countries.  


    Make sure you've tried to resolve them on your own first, as we are busy building new features, fixing things, or running the business. Often times, something simple (like battery not being charged, simcard inserted wrong, user not registered to receive alerts) is the case and is easily fixed. All of these are above. If you're still having problems, email and we'd be happy to help you! We want you to get the most out of your sensor and look forward to your feedback. 

    Frequently Asked Questions