How to Install a Smart Door Window Sensor
By iView US: iView | Affordable Laptops, Tablets, All-in-Ones ... | Published: 2026-10-20
Category: How-to Guides
Learn how to install a door window sensor in minutes. Step-by-step setup, app pairing, and placement tips for reliable realtime alerts.
Quick answer
Mount the S100 sensor on the door or window frame with the included sticker or screws, pair it with the app over a 2.4 GHz network, and test the open/close alert before trusting it.
Where to place the sensor for reliable detection
The S100 Door & Window Sensor works by detecting whether the two halves—the main body and the deputy body—are separated. The main body transmits the signal, so it should sit on the fixed frame, while the deputy body goes on the moving door or window. Keep the gap between them small; the sensor reports open or close status based on that separation, so a wide gap can cause missed alerts.
The sensor communicates over 2.4 GHz Wi-Fi, so it must stay within range of your router. If you live in a larger home, test the signal at the planned location before committing to the sticker or screws. The range spec is up to 50 m outdoors and 30 m indoors, but walls and metal frames reduce that in practice.
Installation steps for the S100 door and window sensor
- Prepare the surface: Clean the door or window frame and the moving part with a dry cloth so the adhesive or screws hold firmly. Pick a spot where the two sensor halves line up within 0.5 inches when the door or window is closed. Check that the gap between the main body and deputy body is not blocked by weatherstripping or paint.
- Mount the main body: Place the main body on the door or window frame and the deputy body on the moving part, keeping them aligned. Use the included sticker for a no-drill install or screws for a more permanent mount. The sensor works with 2.4 GHz Wi-Fi, so keep the mounting spot within range of your router. Test the opening and closing motion once before pressing the sticker down firmly.
- Pair with the app: Open the companion app, add the S100 sensor, and follow the app's pairing flow. The sensor reports open or close status and sends realtime alerts when the app is configured to notify you. Confirm the sensor shows online in the app before you close the setup screen.
- Choose the right power and battery check: The S100 runs on two CR2 batteries with a standby current of 2uA and a battery life of about 2 years. Install fresh batteries and test the low-battery warning in the app if the option exists. Replace the batteries every two years or when the app warns you.
- Place and mount the sensor: Mount the main body on the door or window frame and the deputy body on the moving part, keeping the two aligned. Use the sticker for quick setup or screws for a more permanent hold. Keep the gap between the two bodies small and aligned; the sensor detects open or close by that alignment.
- Connect and test: Open the app, add the device, and follow the pairing steps for a 2.4 GHz network. Walk through the door or open the window, then check for the realtime alert before finalizing the mount. Test the alert while the door or window is open and closed before you commit the sticker or screws.
What to know about the S100 sensor
- S100 Door & Window Sensor Alarm for Home Security, Easy Installation, App with Realtime Alerts: The S100 detects whether a door or window is open or closed and runs on a CR2 battery with up to 2 years of battery life. You can install it once and rely on it for years without frequent battery changes, as long as you place it within the 30 m indoor range.
S100 Door & Window Sensor Alarm for Home Security, Easy Installation, App with Realtime Alerts
