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Knightsbridge Smart Contact Sensor - Wi-Fi Door & Window Monitoring

£799
The RRP is the manufacturer's recommended retail price of the item.
Limited Stock
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Description

The Knightsbridge smart contact sensor is a two-piece magnetic door and window monitor that connects directly to 2.4GHz Wi-Fi networks and sends instant open/close alerts to the SmartKnight app on iOS and Android devices. The sensor requires no separate hub or gateway device — it communicates directly with your router and operates on a single CR2 battery (included) with an expected lifespan of up to one year based on 20 activations per day.

Designed for entry monitoring in homes, offices and rental properties, the sensor fits onto door frames, window frames and cabinet doors using the included adhesive pads. The main sensor body measures 64 x 30 x 22mm, with a smaller 22mm magnet piece that sits on the moving part of the door or window. When the gap between the two pieces exceeds approximately 15mm, the sensor registers an open state and triggers an app notification in real time, whether you are in the building or away.

The sensor integrates with other SmartKnight-compatible devices through the app, allowing automation routines such as turning on a light when a door opens after dark or sending an alert if a window opens while the system is armed. Wi-Fi range is up to 40m from the router depending on wall construction and interference. The polycarbonate housing carries an IP20 rating, suitable for indoor use in dry locations. A low battery warning appears in the app when the CR2 requires replacement.

The sensor connects only to 2.4GHz Wi-Fi networks — it does not support 5GHz bands. Most dual-band routers broadcast both frequencies, but you may need to check your router settings to ensure the 2.4GHz band is active and visible during setup. Once paired, the sensor remains connected until the battery is depleted or the device is manually removed from the app.

Specification
Length 64mm
Height 22mm
Width 30mm
Projection 22mm
Construction Polycarbonate
Finish White
IP Rating IP20
Connectivity Wi-Fi
Warranty 2 Year Guarantee
Warranty Information excluding battery
Downloads

Product Specification Sheet

Frequently Asked

Does this sensor need a hub or gateway?

No. The sensor connects directly to your 2.4GHz Wi-Fi network and communicates with the SmartKnight app without requiring a separate hub device. You will need a compatible smartphone and a working 2.4GHz Wi-Fi connection.

How long does the battery last?

The included CR2 battery is rated for up to one year based on 20 door or window openings per day. Actual lifespan depends on activation frequency, Wi-Fi signal strength and ambient temperature. The app displays a low battery warning when replacement is needed.

Can I use this on windows and doors?

Yes. The sensor works on any hinged or sliding door, window or cabinet where you can mount the two pieces within 15mm of each other when closed. Both pieces attach with adhesive pads, so no drilling is required unless you prefer screw mounting.

Why won't it connect to my Wi-Fi?

The sensor only supports 2.4GHz Wi-Fi networks — it will not connect to 5GHz bands. If your router is dual-band, ensure the 2.4GHz band is enabled and broadcasting. Some routers combine both bands under a single network name, which can cause pairing issues. Consult your router manual to separate the bands or temporarily disable 5GHz during setup.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

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    Description

    The Knightsbridge smart contact sensor is a two-piece magnetic door and window monitor that connects directly to 2.4GHz Wi-Fi networks and sends instant open/close alerts to the SmartKnight app on iOS and Android devices. The sensor requires no separate hub or gateway device — it communicates directly with your router and operates on a single CR2 battery (included) with an expected lifespan of up to one year based on 20 activations per day.

    Designed for entry monitoring in homes, offices and rental properties, the sensor fits onto door frames, window frames and cabinet doors using the included adhesive pads. The main sensor body measures 64 x 30 x 22mm, with a smaller 22mm magnet piece that sits on the moving part of the door or window. When the gap between the two pieces exceeds approximately 15mm, the sensor registers an open state and triggers an app notification in real time, whether you are in the building or away.

    The sensor integrates with other SmartKnight-compatible devices through the app, allowing automation routines such as turning on a light when a door opens after dark or sending an alert if a window opens while the system is armed. Wi-Fi range is up to 40m from the router depending on wall construction and interference. The polycarbonate housing carries an IP20 rating, suitable for indoor use in dry locations. A low battery warning appears in the app when the CR2 requires replacement.

    The sensor connects only to 2.4GHz Wi-Fi networks — it does not support 5GHz bands. Most dual-band routers broadcast both frequencies, but you may need to check your router settings to ensure the 2.4GHz band is active and visible during setup. Once paired, the sensor remains connected until the battery is depleted or the device is manually removed from the app.

    Specification
    Length 64mm
    Height 22mm
    Width 30mm
    Projection 22mm
    Construction Polycarbonate
    Finish White
    IP Rating IP20
    Connectivity Wi-Fi
    Warranty 2 Year Guarantee
    Warranty Information excluding battery
    Downloads

    Product Specification Sheet

    Frequently Asked

    Does this sensor need a hub or gateway?

    No. The sensor connects directly to your 2.4GHz Wi-Fi network and communicates with the SmartKnight app without requiring a separate hub device. You will need a compatible smartphone and a working 2.4GHz Wi-Fi connection.

    How long does the battery last?

    The included CR2 battery is rated for up to one year based on 20 door or window openings per day. Actual lifespan depends on activation frequency, Wi-Fi signal strength and ambient temperature. The app displays a low battery warning when replacement is needed.

    Can I use this on windows and doors?

    Yes. The sensor works on any hinged or sliding door, window or cabinet where you can mount the two pieces within 15mm of each other when closed. Both pieces attach with adhesive pads, so no drilling is required unless you prefer screw mounting.

    Why won't it connect to my Wi-Fi?

    The sensor only supports 2.4GHz Wi-Fi networks — it will not connect to 5GHz bands. If your router is dual-band, ensure the 2.4GHz band is enabled and broadcasting. Some routers combine both bands under a single network name, which can cause pairing issues. Consult your router manual to separate the bands or temporarily disable 5GHz during setup.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.