Door and window sensor · exact-product guide
SwitchBot Contact Sensor: door fit, hub limits and Canadian buying guide
Contact Sensor combines a magnetic open/closed contact with light and motion sensing so a SwitchBot scene can distinguish more than a simple door state. The useful result depends on exact magnet alignment, a stable mounting surface and understanding that remote alerts and ecosystem actions require a compatible hub.
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Paid CJ affiliate link; commission never changes our analysis. Verified September 1, 2026.Short answer
A useful renter-friendly sensor when the body and magnet can stay aligned within 30 mm through the full motion of the door or window. Buy a compatible hub as part of the plan if the goal is away-from-home alerts, voice announcements or automation with other devices.
Verified specifications
The facts that change the decision
- Exact priced variant
- 1-pack
- Primary state
- Door or window open/closed
- Magnet alignment
- Bottom edges aligned · components within 30 mm
- Motion sensing
- Published maximum 5 m and 90° horizontal field
- Additional sensing
- Ambient-light and entry/exit interpretation for scenes
- Power
- 2 × AAA alkaline batteries
- Remote features
- Compatible SwitchBot hub required for remote alerts, voice alarm and cross-device scenes
Good fit
This product may fit if…
- The door or window leaves a flat, dry area where both pieces remain aligned throughout movement.
- You want open/closed state to trigger lighting, cameras, air treatment or another SwitchBot scene.
- A compatible hub is already present or included in the budget for remote notifications.
- The installation can be tested before relying on it for a child, pet, medicine cabinet or exterior entry.
Stop before buying
Do not order yet if…
- The magnet cannot remain within 30 mm or cannot align with the bottom of the sensor body.
- The mounting point receives direct sun, strong heat or moving trim that can cause unreliable motion or contact detection.
- You need away-from-home alerts but do not plan to add a compatible hub.
- The device would be treated as a certified alarm system or the only protection for a critical entrance.
Installation
Five-step verification plan
- 1
Close and open the exact door or window fully while checking gaps, trim movement, handles and weatherstripping.
- 2
Dry-clean the mounting surfaces and temporarily position both pieces with the bottom edges aligned within 30 mm.
- 3
Add the sensor in the SwitchBot app, update firmware and verify open, closed and motion states before final adhesion.
- 4
Add the compatible hub if required, then test phone notifications and every linked scene with the household away.
- 5
Repeat the test after the door has been used normally and after a large indoor/outdoor temperature change.
After installation
What ownership requires
- Inspect adhesive, alignment and reported state whenever the door rubs, sags or receives new weatherstripping.
- High trigger counts shorten battery life; replace both AAA cells together and verify the low-battery warning clears.
- Review scene logic after changing household routines so an open door does not trigger unsafe or unwanted automation.
FAQ
Questions before buying
Does it work without a hub?
Basic nearby Bluetooth use is possible, but remote alerts, voice announcements and automation with other devices require a compatible SwitchBot hub.
How close must the magnet be?
SwitchBot specifies aligned bottom edges and a maximum 30 mm distance between the two components.
Is this a complete security system?
No. It is an ecosystem sensor for status and automations, not a monitored or certified alarm service.
Verified compatibility
Useful companion products
Add these products only for the function described on the page. A hub is not automatically required for every use.
SwitchBot Hub 3
Matter bridge, infrared remote, scene controller and indoor climate display for a connected SwitchBot home.