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Stalwall D21 Smart Wireless WiFi Magnetic Door Window Sensor Alarm App Remote Control Support Google Assistant Alexa for Home Security
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Stalwall D21 Smart Wireless WiFi Magnetic Door Window Sensor Alarm App Remote Control Support Google Assistant Alexa for Home Security

- White

Query Status of Doors and Windows Through Alexa: Alexa, Does My Bedroom Window Open?
4.76 17 Customer Reviews
    COD This product supports COD on delivery. Suggestions: Do not place orders with non-COD products, otherwise you will not be able to choose COD payment method.
    Ship between: Aug 02 - Aug 04, Estimated Shipping Time: business days Order Processing Time may require a few days. Once dispatched from warehouse, Shipping (or Delivery) Time depends on the Shipping Method.
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Stalwall D21 Descriptions

Stalwall D21 Door Window Sensor
The Stalwall D21 smart door and window magnetic sensor can detect the opening and closing status of doors, windows and drawers etc., and send notifications to you via APP. You can also check the current status and historical records. Realizing linkage with other smart devices equipped with Tuya solutions, such as smart light bulbs, smart air purifiers, smart cameras and other smart home products. Smart door and window magnetic sensor is composed of sensor body and magnet. It detects the opening and closing of door and window through the proximity and separation of sensor body and magnet.

Main Features:
 Support Google Assistant, Google Home, Amazon Alexa: can ask those helpers to check the status of the door and window.
 App Remote Control: you can check the status of the door and window via APP at any time from anywhere.
 Easy Connection: smart phones can be connected independently through 2.4G WiFi, without the need to purchase additional gateway.
 Fast Response: by connecting to your 2.4G WiFi router at home, the door and window opening and closing actions can quickly trigger and push messages to your smartphone.
 Record Tracking: all actions (turn on / off) will be recorded in the mobile phone APP.
 Smart Linkage: can linkage with other smart devices equipped with Tuya solutions, such as smart light bulbs, smart air purifiers, smart cameras and other smart home products.
 Long Battery Life: 2 x AAA batteries last for over 8 months.
 Anti-dismantling Alarm: equipped with anti-dismantling detection switch, the alarm information will be pushed to your phone when the sensor is removed.

Wireless Connection: WiFi
WiFi Protocol: IEEE 802.11 / b / g / n
APP: Smart Life



Brand: Stalwall
Model: D21

Main Panel Specifications

Working Time: 8 months
Standby time: 10 months
Charging Time: AAA battery can not charge

Infrared Detector Specifications

Transmission Frequency: 2.4GHz


Power Cable Length: no

Dimension and Weight

Product weight: 0.0600 kg
Package weight: 0.0750 kg
Product size (L x W x H): 6.40 x 3.20 x 1.90 cm / 2.52 x 1.26 x 0.75 inches
Package size (L x W x H): 6.70 x 4.50 x 4.00 cm / 2.64 x 1.77 x 1.57 inches

Package Contents

Package Contents: 1 x Smart Windows and Doors Magnetic, 2 x Double-Sided Adhesive, 1 x English Manual
Stalwall D21 Door Window Sensor - White
Stalwall D21 Door Window Sensor - White
Stalwall D21 Door Window Sensor - White
Stalwall D21 Door Window Sensor - White
Stalwall D21 Door Window Sensor - White
Stalwall D21 Door Window Sensor - White

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Customer Reviews

4.76 out of 5
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See all 17 reviews Write a Review
  • ivan
    Yes (0) Color: White
    Este sensor se agrega muy facil con smart life, el producto ya trae todo pulas y goma para pegar.

    Tiene muy buena calidad, sobre todo que tiene algo interesante, una trampa que si es retirado tambien te avisa.

    Usa pilas 3 AAA por lo que es mejor ya que puedes usar recagables.

    En la App se muestra los estados, de abierto, cerrado, semi abierto y estado de la pila

    Lo padre es que puedes configurar escenas con smart life para automatizar y automaticamente! loa agrega a ALEXA por lo que el sensor tambien queda dentro de la app de ALEXA.

    Todo en la nube de smar life, esta es mejor opción que wyze ya que esta muy limitado.

    Lo malo o desfavorable seria el tamaño del señor, es muy grande (el tamaño de las pilas AAA) por lo que deberas considerar eso

    Dec 13,2019

  • Leecie
    Yes (1) Color: White
    Easy to setup
    I like these things. Easy to setup, reliable sensor for doors and windows. We have these for three doors and they work great. We set them up in not even five minutes, used the tape to attach each piece of the sensor to the door and frame, and it was recognized by the app. We mounted ours in the upper areas of the door, one piece on the door, one on the frame itself. We found that the two components do not have to be touching directly in order for these to work, I have recently come home from work to find my door was left unlocked. Now with the automation I have setup, the door locks as soon as this sensor reports closed (nearly instantaneous)! They are great for our uses.

    Aug 23,2019

  • Rick
    Yes (0) Color: White
    Pretty good
    Pretty good.

    The work with SmartLife.
    I now have a nightlight in my bedroom that comes on if either garage doors is open, so I don’t go to bed with them open.
    They should work with Alexa routines (They are available as a trigger) but they don’t seem to work.

    Battery life is good (6 month point, still 70%)

    I had trouble getting them to work for the garage door.
    The magnet “range” is only about 1/4”.
    The door shifts around in its tracks.

    Jan 23,2021

  • Mary Walton
    Yes (1) Color: White
    Works well with app
    The install process was quick and easy, only taking a few minutes. I screwed in the bulb, turned on the lamp and followed the simple instructions through the app. So far, the actions have worked flawlessly. I also like the option to set up schedules manually. I like being able to use app to control the bulbs. I will definitely be purchasing more to add to my ecosystem. Highly recommended.

    Aug 26,2019

  • Allie
    Yes (0) Color: White
    We love it!
    We love it. After opening the box I had it setup and working in less than an hour. It was easy setting up this type of action via app and they work great. I can't tell you how much money I have wasted in the past. Worked perfecting for my house Really appricitate how simple it is to set it up with the app and then get it quickly added. Very pleased.

    Aug 24,2019

FAQ for Stalwall D21

  • What is the network communication mode between Stalwall D21 door and window magnetism?

    They are connected via WIFI. Connect to the WIFI router at home through mobile APP without purchasing any additional gateways.
  • Are there any requirements for routers?

    No, as long as the 2.4G WIFI router can connect, do not support 5.0G router.
  • What is the role of magnetism in Stalwall D21 doors and windows?

    After installing the door magnetic sensor, the opening and closing of the door or window will receive the alarm message on the app side of the mobile phone.
  • What is the name of the APP?

    Smart life, a lot of smart home products use this APP.
  • Can Stalwall D21 link other products?

    Yes, as long as you use Smart Life products, you can achieve linkage. For example, after the door is opened by the magnetic sensor of the door and window, the intelligent light bulb can be turned on automatically at night. When the door opens, the light opens, which is very intelligent and comfortable.
  • What is the difference between Stalwall D21 door and window magnetism and millet?

    Stalwall D21 communicates with WIFI and connects directly to the router at home without having to buy another gateway, while Xiaomi communicates with ZigBee and needs an additional ZigBee gateway (about $30).
  • What battery does the Stalwall D21 use?

    2 AAA batteries, which were already included at the time of purchase. How long does the battery last? Normal use can usually reach more than 8 months. You don't have to replace the battery for nearly a year.
  • Is it convenient to replace the battery?

    It is very convenient to remove the back cover and replace it.
  • What should I pay attention to when installing?

    Note that the main and secondary door magnets can be as close as possible within the 20mm distance when closed.
  • Will there be an alarm if the magnetism of the door and window is removed?

    There will be an alarm, and if someone removes it, the mobile phone APP will immediately arrive at the alarm message.
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Item processing time
After receiving your order,we require some time to test the product to ensure its quality.The exact processing time varies depending on the item.The average processing time is 3 working days.but this can also be affected by the item's stock status. For small quantity orders,the processing time is 1-3days while larger quantity orders may require 2-5days.
Shipping methods
China Warehouse:
Shipping Type Country or Region Arrive within 1-7 Days Arrive within 8-15 Days Arrive within 16-30 Days Arrive within 31-45 Days Average Time (Days)
Unregistered Air Mail or Registered Air Mail United States 0.52% 44.87% 49.88% 3.5% 18.13
Spain, United Kingdom, Italy, Germany, France & Portugal 5.18% 43.44% 48.34% 1.17% 15
Netherlands, Greece, Poland, Hungary, Slovakia, Czech Republic 2.96% 40.34% 52.54% 3.74% 18.66
Russia 0% 4.45% 84.41% 11.1% 28
Japan, Korea 0% 21.30% 68.80% 9.66% 17.75
Brazil 0% 0% 23.91% 72.09% 38.6
Turkey 0% 37.75% 59.05% 3.1% 20.33
Thailand, Singapore & Malaysia 0% 40.39% 56.12% 2.6% 16.2
Other countries 0.7% 38.79% 47.94% 8.56% 23.57
Priority Line United States 12.28% 79.05% 7.4% 0.52% 11.75
Spain, United Kingdom, Italy, Germany, France & Portugal 8.44% 66.56% 23.45% 0.45% 13.55
Russia 0% 3.48% 75.79% 20.04% 31
Brazil 2.21% 6% 61.29% 25.46% 30
Turkey 20.42% 77% 3% 0.08% 10
Australia 7.67% 86.60% 5.68% 0% 11
Korea 97.54% 1.57% 0.89% 0% 7
Japan 95.80% 2.09% 0% 0% 6.84
Thailand, Singapore & Malaysia 58.96% 41.04% 0% 0% 8.45
Other countries 22.33% 30.8% 27.62% 17.64% 18.65
Expedited Shipping ALL countries(EMS) 3.8% 46.8% 26% 15% 14.8
ALL countries(DHL) 65.8% 25.75% 3.86% 0.37% 6.72
GW Warehouse: Typically 3-5 days to the UK, 3-7 days to other European countries.
USA Warehouse: Generally, 3-7 days to a USA address.
ES Warehouse: Generally, 2-5 days to the Spain, 3-7 days to the Portugal.
Shipping from warehouse nearest to shipping address is faster. Additional charges may apply.
Note: This is a general guide and delays maybe caused force majeure, natural disasters, inclement weather, war, public holidays, and factors outside our control. Generally speaking, we offer free shipping for Stalwall D21 to United States (US, USA), United Kingdom (UK, GB), Germany, Italy, France, Spain, Portugal, Poland, Brazil, Russia, Japan, Greece, Austria, Hungary, Slovakia, Czech Republic, Ireland, Lithuania, Israel, Denmark, Norway, Sweden, Canada, Australia, Netherlands, Korea, Turkey, Mexico, Ukraine, Romania, Columbia, Thailand, Singapore, Malaysia etc. Please choose the shipping methods for the final price.

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For Brazil customers, we accept Boleto: you only need to fill in the payment information, remember your Boleto Voucher information and pay it within 3 days at any Boleto stores.
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Do you want to bulk buy Stalwall D21 ? Please submit your wholesale Stalwall D21 inquiry below. Please note we usually don’t offer free shipping on wholesale Stalwall D21 orders, but the wholesale price will be a big bargain.

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