Very useful devise
Very easy to set up

Unreliable, laggy, and not worth the tinkering
I wanted a compact, low-maintenance motion + light sensor for some simple quality-of-life automations—hall lights at night, desk lamp on cloudy afternoons, that kind of thing. On paper, this checks all the boxes: Bluetooth, light level readings, an app with scenes, and voice-assistant compatibility. In real-world use, it’s been a string of small frustrations that add up to an unreliable experience I can’t recommend if you value consistency.Setup wasn’t awful, but it wasn’t smooth either. The app found the unit after a few tries, then lost it during a firmware update and forced me to re-add it from scratch. Once paired, I gave it a friendly name and dropped it into a “Hall” room. Within a day, the device tile went gray and the app claimed it was “out of range,” even though my phone was fifteen feet away with one interior wall in between. Bluetooth devices can be finicky, sure, but this one drifts in and out often enough that you start to wonder if the range claims are best-case lab numbers you’ll rarely hit at home.Motion sensing is the headline feature, and it’s where the cracks really show. Latency is inconsistent. Sometimes a pass through the hallway triggers an automation in roughly a second; sometimes it’s three to four seconds; sometimes nothing happens at all until I double back. The delay is more noticeable in rooms where you expect instant response (bathroom at night, for example). I tried angling the sensor, raising it higher, lowering it, and even moving it to a different wall. Performance improved a hair when it had clear line-of-sight and no mirrors nearby, but the basic issue—“will it notice me this time?”—never fully went away. Missed triggers are the frustration you remember, not the ones that worked.Then there’s the lux reading. The idea is great: use ambient light to decide whether to turn a lamp on. In practice, the lux value updates slowly and sometimes jumps in chunky steps that don’t reflect what the room actually feels like. Cloud cover rolls in, the room dims, and the reading barely budges for a few minutes. Ceiling lights flip on, and the value spikes after a random delay. If you’re trying to build a scene that only runs when it’s truly dark, these lags create either lights turning on in daylight or lights refusing to turn on until it’s already uncomfortably dim. After a week of tweaks to thresholds, I gave up and tied the scene to a fixed time window. That defeats half the point of having a light sensor.The app experience doesn’t help. The UI looks modern enough, but basic things take too many taps. Editing an existing scene feels like filling out a form: pick the device, pick the trigger, pick the condition, pick the action, then wait for the spinner. It also loves to “save” without actually applying changes, which has you standing in a dark hallway wondering why your new logic didn’t fire. Push notifications arrive late or not at all, so you can’t tell if a scene failed or the sensor never reported in. When the device goes gray, the “reconnect” flow is hit-or-miss; sometimes backing out and back in revives it, sometimes you’re toggling Bluetooth, killing the app, and re-pairing like it’s 2012.Battery life is another sore spot. Marketing promises “long-lasting,” but with default motion sensitivity and reporting intervals, the battery started dropping sooner than expected. The app’s battery readout is vague; it hopped from “high” to “medium” in a couple of weeks and then lingered there while performance clearly degraded. I dialed back sensitivity, limited lux reporting, and still ended up replacing the cell far earlier than I do on my Zigbee motion sensors. Coin cells aren’t pricey, but replacing them this often in a device that underperforms is salt in the wound.Voice-assistant integration was the clincher for me, and not in a good way. The device shows up as a motion sensor, but the state updates lag in the voice platform. That means routines based on “motion detected” fire late or not at all. Even when they do fire, clearing the motion state can take longer than it should, so lights with “auto-off after X minutes of no motion” sometimes stay on well past X minutes, or shut off unexpectedly because the sensor decided it saw nothing during a perfectly normal stretch of activity. You end up adding bandaids—longer timers, duplicate conditions—that make everything feel brittle.Physically, it’s fine: small and unobtrusive, with a little mount and some adhesive. The problem is placement doesn’t fix the reliability. I tried it at eye level in a hallway, waist height near a doorway, and on a shelf looking out across a living room. False triggers from sunlight and HVAC movement weren’t terrible, but missed triggers were. The whole appeal of a motion sensor is “it just works,” and this one doesn’t clear that bar.There are also odd quirks that wear you down. The device occasionally freezes in a “stuck active” state and telegraphs constant motion even when the room is empty; the only fix was pulling the battery. Lux sometimes reports zero in a bright room after a reboot, then corrects itself ten minutes later. Firmware updates are supposed to help, yet one update made detection noticeably worse until I factory-reset and set everything up again. If you like tinkering, maybe that’s part of the fun. If you want a dependable appliance, it’s a dealbreaker.I ran side-by-side comparisons with other sensors I already own. A cheap Zigbee puck in the same hallway fired instantly and consistently. A different brand’s Bluetooth sensor—hardly premium—registered motion more reliably and reported ambient light more in line with reality. That highlights the core issue here: this isn’t the ceiling for wireless sensors—far from it. It’s just this particular unit that underdelivers.Could you squeeze better performance out of it? Maybe, if your phone or hub lives within a few feet, you keep the path perfectly clear, and you’re willing to tune reporting intervals and motion sensitivity like a hobby. But that’s not what most people want from a simple motion + lux device. The value proposition disappears when you’re babysitting connectivity, replacing batteries more often than expected, and re-authoring scenes to compensate for unreliable data.I also can’t shake the feeling that the range claims are optimistic. In my small apartment, the unit struggled past a single wall. In a house with more distance and more walls, you’re probably adding repeaters or nudging your hub closer to make it usable. Bluetooth can do well with thoughtful engineering, but this particular implementation feels underpowered and overly sleepy to save battery—great for longevity in theory, not so great when it misses events.After several weeks of living with it, I pulled it from my “critical” automations and relegated it to “nice if it works” tasks, like nudging a lamp on at dusk. That’s not where a motion + light sensor should end up. If you’re building a robust setup, consider something that speaks a home-automation-friendly protocol with proven range and latency, and an app that treats automations as first-class features rather than afterthoughts.I wanted a reliable hallway companion. What I got was a temperamental gadget that’s always a half-step behind, occasionally a full step. For something as simple as turning lights on and off, that’s one compromise too many.

Easy setup
Easy to setup. Bluetooth works great. Easiest sensor so far

Not suited to outdoor use
This is not really designed for outdoor use but I mounted it in a very sheltered place under the eaves. I found that the detection range was very limited even on high sensitivity. Even without any bad weather having occurred it started spuriously turning on and off and the fixes suggested online did not help so I have returned it,I am, however, very happy with all the other Shelly devices I have purchased.

Excelente

Réagis en moyenne en une à trois secondes, en fonction de l’état du capteur.

Ho acquistato questo Shelly Blu Motion in aggiunta ad altri due kit che ho comprato in precedenza.Questo però, è arrivato con la batteria completamente scarica, o addirittura, non funzionante, perchè non si è mai acceso. Meno male che c’è amazon, ma resta comunque un prodotto consigliatissimo.Se solo Shelly mettesse la classica linguetta che separa i contatti dalle batterie.