Aqara Door and Window Sensor P2

The flat magnet is the reason to look twice

Door and Window Sensor P2 is most interesting when an ordinary contact sensor is awkward to fit. Aqara includes a slim flat magnet as well as the conventional small magnet unit. That gives you another way to line up the two halves on a cramped window or cupboard frame without changing the job the sensor does.

The larger half is less discreet: its 77 × 22 × 22 mm body is worth measuring against the intended position. The regular magnet is 36 × 11.5 × 7.3 mm. A thin magnet cannot solve every difference in height or every obstruction, and the sensor still needs accessible space for battery replacement.

At the US store's $29.99 price on September 10, 2026, the mounting options need to earn their keep. A single unit comes to $39.98 with listed standard shipping in the contiguous US and DC, before tax.

A good trigger for a specific door

P2 reports open or closed state. That can make a cupboard light come on as the door opens, flag a window left open, or give a supported heating routine an input it otherwise lacks. Those are useful, understandable improvements without adding a camera to the room.

It does not establish that a door is locked or that nobody is inside. An open/closed notification is only as useful as the routine receiving it, so start with the particular action you want rather than putting a sensor on every available surface.

The included CR123A battery keeps wiring out of the installation. It is replaceable, but it is a less familiar spare than the AAA used by IKEA's MYGGBETT. Aqara's claimed longevity depends on the connected ecosystem and network; we have not measured battery life or missed state changes.

Pay for today's hardware

P2 connects over Matter and Thread without an Aqara hub, provided the home already has a suitable Matter controller and Thread border router. That is convenient for an existing Thread home. Buying that infrastructure for one cupboard sensor changes the economics considerably.

The store also advertises a programmable button, tamper alerts and sensitivity adjustments, while retaining outdated future-update language. The evidence checked for this review does not establish the complete advertised feature set as released and available in the buyer's app. Do not pay extra on the assumption that the front button is a usable scene remote or that tamper protection is included in every platform.

This is an indoor sensor. Its specified temperature range does not make it suitable for an exposed mailbox or garden gate, and neither the magnetic contact nor Matter turns it into a complete alarm system.

A cheaper sensor may do the same job

IKEA MYGGBETT was listed at $11.99 US on the same date, with its AAA battery sold separately. It is the stronger starting point for a straightforward indoor opening trigger if its required close alignment fits the frame. Aqara's flat magnet is a reason to compare the hardware before choosing purely on price.

Eve Door & Window supplies magnet spacers, useful for a recessed frame that needs the opposite solution: raising the magnet. Choose the sensor that fits properly. If an existing contact sensor already reports the door reliably and supports the routine you use, replacing it with P2 adds little.