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WIFI Smart Door/Window Sensor

(24 customer reviews)


  • Security monitoring: SM300 sensor offers round the clock monitoring of your home. Use on doors, windows, cabinets, drawers or any other objects where you want to be notified whether they are opened or closed. With the SM300 sensor it is easy to keep an eye on the security of your house anytime from anywhere.
  • SM300 is compatible with Amazon Alexa & Google Home. Simply use your voice to check the status of your doors or windows (e.g. Alexa, is my front door is locked?).
  • No Hub required! SM300 is a standalone product do not require anything else, but WiFi connectivity.
  • By using the sensor with IFTTT it is possible to set up different scenes (e.g. Philips Hue light is on when a door is opened)
  • No obtrusive wires! Simple installation using the supplied 3M adhesive stickers.
  • Monitor critical places of your house, office, shed, garage etc. (indoor use only)
  • Share the sensor with your family members through the Smart Life app

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SKU: SM300 Category: Tags: , ,


The SM300 is a Door/Window Sensor that can be installed on doors, windows, cat flaps, wardrobes, drawers and any other objects that open and close. The sensor transmits open/close signals to your device when two parts of the kit are moved away or attached together. It will also transmit an alert signal in case of a low battery. The energy saving WiFi module allows a transmitting distance of 40m to the wireless router.

Amazon Alexa
Google Home

1. Download Smart Life application from App Store or Google Play
2. Open Smart Life app, register and log in
3. Select Door from the list of available new devices to add the door sensor
4. Attach the sensor using the adhesive stickers to a door/window with the gap of ≤1cm between the parts

SM300 Wireless WiFi Windows/Door Security Sensor
Two 3M adhesive stickers & Installation and Operating Instructions

Additional information

Weight 55 g
Dimensions 9.5 × 4 × 2 cm

Battery: AAA1.5V x 2
Protocol: IEEE 802.11b/g/n Wireless Range: 40m
Operating Temperature: 5℃~ 40℃
Operating Humidity: 20% ~ 85%
Storage Temperature: 0℃ ~60℃
Storage Humidity: 0% ~ 90%
Standby time: 6 – 10 months
Wireless Type: 2.4GHz

24 reviews for WIFI Smart Door/Window Sensor

Based on 24 reviews

Customer Images

Image #1 from Anonymous
Image #1 from Anonymous


Does exactly what it says on the tin! I used my own smaller magnet as what was included is too big for my setup. Very happy!

Image #1 from Anonymous
  1. James (verified owner)

    Verified reviewVerified review - view originalExternal link

  2. Ligge

    F?r meine zwecke ungeeignet da der Sensor erhebliche Probleme im Iobroker aufweist, von daher geht er zur?ck.Da gibts von Medion bessere alternativen.

  3. Sam

    These are excellent little things. I connect them to the Tuya app, and I get a notification if the door is opened. They’re great for peace of mind, both as an intruder alarm, and for making sure that you actually did close the front door!

  4. Jan R.

    Funktioniert perfekt und wird ohne Probleme vom Echo Plus als Kontaktsensor erkannt. Der Kontaktsensor ist etwa 15 Meter vom Echo Plus entfernt und die Verbindung ist zuverl?ssig.Ich nutze den Sensor um meine Tado Heizung im Schlafzimmer auszuschalten wenn das Fenster ge?ffnet wird und wieder in den Automatik Modus zu schalten wenn ich das Fenster schlie?e, alles ?ber eine Routine mit IFTTT und Alexa.

  5. Dad 1947

    does its job perfectly, many thanks

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