Home · Strong theory
Entry-Point Tamper Geometry
Every door and window guards itself — no stick-on sensors, no batteries.
The physics is solid; our own validation is scheduled.
How it works
A door or window is a big flat surface that bounces WiFi in a very particular way. Move it even a little — open it, pry it, prop it ajar — and those echoes shift measurably. Because the system reads the echoes themselves, it knows the state a window is in, not just the moment it moved.
In the physics: A door or window is a large planar reflector that defines specific multipath echoes. Rotating a door 10 degrees or lifting a sash by 5 cm moves reflection points tens of cm, shifting individual path delays by ~1 ns and re-routing which paths exist at all. Glass and wood panels also change transmission through that aperture. This is a static geometric change — invisible to Doppler-only systems but directly visible in the CIR delay set.
See it work
This is real pipeline output for Home, replayed. The exact reading depends on your room.
Go deeper
How the field becomes an answer
How we prove it
CSI-Bench/OPERAnet door open-close activities as a sanity base, then own-hardware: 20 sessions of open/pry/ajar/remove-screen on 4 window types, measure delay-set distance vs baseline and false-alarm rate over a 2-week undisturbed control period (119-day drift control shows the baseline holds).
Who it is for
"Every window is a sensor and none of them need batteries." Replaces dozens of contact sensors for alarm installers and vacation-rental owners.
The matching solution
Complete first-room estimateHome Presence & Intrusion2 nodes · ~$90 parts · 45 min Request kit, subscribe, or set up →Compatible DIY hardware options
45 min · intermediate
60 min · intermediate