Shelly Presence and Motion Sensor Breakdown: Protocol, Range, and Spec Comparison

Best for: Zigbee indoor lighting and hallway automations

Pros

• 5-year battery life
• Compact 28g body
• Dual Zigbee and Bluetooth

Cons

• Requires gateway or proxy

The Shelly BLU Motion ZB operates as a dual-connectivity motion and ambient light sensor engineered for local automation ecosystems. Utilizing both Zigbee and Bluetooth communication, this compact unit provides immediate occupancy tracking alongside lux measurement, enabling nuanced automations such as illuminating dark hallways only when natural light falls below a set threshold. With a line-of-sight wireless range rated up to 328 feet, it communicates back to compatible Zigbee coordinators or Shelly gateways while maintaining hardware-level AES encryption to secure packet transmissions against local network eavesdropping.

Power management is a major technical advantage of this unit. Operating on a single included nonstandard battery, the device reaches an average operational lifespan of five years due to energy-efficient sleep cycles between PIR trigger events. Weighing only 28 grams with dimensions of 1.46 by 1.1 by 1.46 inches, the chassis mounts discreetly to vertical walls or transitional corners. Integrators evaluating a multi-protocol ecosystem alongside an aqara motion sensor will appreciate that this Shelly device bridges cleanly into Home Assistant via standard Zigbee implementations or into the Shelly Smart Control app through Shelly Gen4, Gen3, Plus, or Pro host devices.

While the hardware performs admirably for entryway awareness, living room lighting, and garage movement alerts, it relies on line-of-sight 2.4 GHz propagation, meaning dense concrete or metal structural barriers will attenuate signal strength faster than sub-GHz alternatives. When deployed within an existing Zigbee mesh network, however, it delivers rapid state changes and actionable lux reporting across residential temperature environments up to 105 degrees Fahrenheit.

• Dual Zigbee and Bluetooth wireless communication with AES encryption
• Integrated PIR motion detection paired with ambient light lux sensing
• Extended five-year operational life from a single included battery
• Maximum operational wireless range rated up to 328 feet

Best for: Long-range acreage and sub-GHz Z-Wave networks

Pros

• 5-mile long range
• 4000 device network support
• Customizable pet sensitivity

Cons

• Requires dedicated Z-Wave hub

The Shelly Wave Motion US LR is engineered specifically for uncompromising range and enterprise-level wireless capacity. Operating on the Z-Wave Long Range standard at 912 MHz alongside backward-compatible Z-Wave Plus at 908.4 MHz, this motion detector circumvents the crowded 2.4 GHz spectrum entirely. The defining technical achievement of Z-Wave Long Range is transmission distance: the unit supports line-of-sight communication up to 1.5 miles at full power directly to a compatible Z-Wave hub, eliminating the need for repeating mesh nodes between remote outbuildings and the central controller.

Network architecture scalability is drastically expanded under ZWLR specifications. The sensor can be integrated into large-scale networks supporting up to 4,000 nodes, bypassing the legacy 232-device limit inherent to classic Z-Wave mesh networks. Powered by three included nonstandard batteries, the device continuously monitors for unauthorized movement and shifts in room occupancy. For households with animals, the sensor offers configurable alarm zones and customizable sensitivity parameters to mitigate false triggers caused by pets, ensuring that energy-saving lighting and heating cut-offs execute reliably.

Because the unit strictly uses Z-Wave frequencies, an external Z-Wave smart hub is mandatory for pairing, configuration, and automation routing. For facilities requiring long-term infrastructure deployments, Shelly Europe supports this hardware with a 7-year spare part availability window alongside a 3-year device warranty, making it an exceptional option for commercial properties or residential acreage where standard wireless protocols lose connectivity.

• Z-Wave Long Range technology transmitting up to 1.5 miles at 912 MHz
• Scalable network support handling up to 4,000 devices per controller
• Customizable detection zones and sensitivity calibration for pet immunity
• Three included nonstandard batteries providing sustained field endurance

Best for: Basement pipes and wide-perimeter floor monitoring

Pros

• Extendable leak cable
• Matter and Wi-Fi onboard
• IP44 splash resistance

Cons

• Larger footprint than Flood S

The Shelly Flood Gen4 addresses fluid-based presence and environmental intrusion through an advanced multi-protocol architecture. Incorporating Wi-Fi, Bluetooth, Zigbee, and native Matter interoperability into a single modern enclosure, this floor-mounted sensor connects directly to high-level automation controllers such as Apple HomeKit, Google Home, Amazon Alexa, and Samsung SmartThings. Instead of confining detection strictly to the body of the device, the Gen4 includes an extendable precision leak sensor cable, permitting installers to route physical detection leads along baseboards, beneath complex pipe junctions, or around perimeter drains.

The physical unit is constructed from robust plastic engineered to an IP44 ingress protection rating, defending internal logic against splashing moisture while the external probe conducts digital fluid sensing. Measuring 3.82 by 2.91 by 0.91 inches and weighing 91 grams, its low-center-of-gravity floor mount layout prevents accidental displacement by vacuum cleaners or maintenance activity in basements and laundry rooms. Integrating fluid monitoring alongside camera platforms like a reolink 180 degree camera allows facility managers to visually verify mechanical room alerts the moment water presence triggers a state transition.

Because the Gen4 carries integrated Wi-Fi alongside Zigbee, users can operate the device in standalone cloud or local IP modes without investing in a dedicated protocol bridge. Whether deployed in a primary residence or a seasonal cabin, the Shelly Smart Control interface provides instant remote push notifications when liquid contacts the probe, making it an essential layer of defensive automation for vulnerable utility areas.

• Multi-protocol connectivity supporting Wi-Fi, Bluetooth, Zigbee, and Matter
• Extendable precision leak sensor cable for wide-perimeter water capture
• IP44-rated splash-resistant construction suited for basements and utility rooms
• Digital output signaling directly to major third-party smart ecosystems

Best for: Submersible appliance leak and rain detection

Pros

• IP67 waterproof rating
• 2 mm moisture detection
• Outdoor rain mode

Cons

• Fixed underside contact pads

The Shelly Flood S Gen4 presents a hyper-compact, low-profile alternative for moisture detection in spatial footprints where standard sensor bodies cannot fit. Measuring 3.03 by 3.03 by 0.91 inches in an oval form factor, this battery-powered unit features a unique large-surface triple-pad stainless-steel sensing base. With a tight contact sensitivity rated to register moisture films as thin as 2 millimeters, the Flood S Gen4 delivers instantaneous alerts the moment liquid bridges the conductive stainless terminals underneath the housing.

Engineering resilience is substantially elevated on this model, boasting a fully certified IP67 waterproof rating that allows the device to withstand temporary complete submersion without destroying the internal circuitry. Beyond conventional interior plumbing monitoring under washing machines and dishwashers, the unit includes a specialized Rain Detection mode. When placed outdoors, this firmware profile translates falling rain into standard binary state changes rather than triggering an emergency flood siren, enabling users to automatically pause yard irrigation or close motorized skylights.

Like its sibling Gen4 unit, the Flood S operates across Wi-Fi, Bluetooth, Zigbee, and Matter frameworks, running off a single included nonstandard cell. Automations configured within the Shelly platform can tie this sensor directly to motorized inline shutoff valves, cutting off primary water lines within milliseconds of conductive bridge formation to prevent catastrophic structural flooding.

• Certified IP67 waterproof rating capable of handling full fluid submersion
• Triple-pad stainless-steel underside design with 2 mm contact sensing
• Integrated Rain Detection mode for outdoor weather-driven automations
• Direct cross-platform compatibility across Wi-Fi, Zigbee, Bluetooth, and Matter

Best for: Extended-range door tilt and entry security

Pros

• 5-mile ZWLR range
• Tilt angle measurement
• Integrated lux sensor

Cons

• Z-Wave gateway required

Physical entry points represent the frontline of perimeter presence detection, and the Shelly Wave Door Window White provides commercial-grade tracking across portals, gates, and windows. Operating via Z-Wave Long Range (ZWLR) on 912 MHz with support for standard Z-Wave Plus at 908.4 MHz, this dual-function sensor reports open and closed states, measures environmental tilt angles, and captures ambient light lux values. With transmission capability extending up to 1.5 miles in open space, the device resolves communication dropout issues commonly encountered when securing detached storage sheds or distant perimeter boundaries.

The unit measures an ultra-slim 0.47 by 0.27 by 1.38 inches, allowing it to adhere along narrow window jambs or structural door casings without obstructing moving hardware. Combining magnetic contact detection with an integrated photoelectric sensor, it tracks not only whether an entry is cracked open, but also measures angular deviation on tilt-open hopper windows and overhead garage bays. Pairing entry contact state triggers with an exterior video checkpoint such as a eufy security camera doorbell establishes a synchronized entrance audit trail for smart security networks.

Operating within the Z-Wave Long Range topology allows this contact sensor to communicate directly with the host controller in a star configuration rather than relying on hopping through AC-powered mesh repeaters. This drastically lowers packet transmission latency, ensuring that welcome automations—such as triggering entryway lights when the front door swings open after sunset—execute without human-perceptible delay.

• Sub-GHz Z-Wave Long Range radio architecture with coverage up to 1.5 miles
• Three-in-one detection incorporating contact closure, tilt angle, and lux level
• Direct hub communication supporting large deployments up to 4,000 nodes
• Compact physical profile measuring just 0.47 by 0.27 by 1.38 inches

Best for: Custom low-voltage retrofits and gate monitoring

Pros

• Universal low-voltage power
• Dual dry contact outputs
• Built-in Wi-Fi extender

Cons

• Requires manual low-voltage wiring

The Shelly Plus Uni Smart Wi-Fi is an ultra-miniature, low-voltage universal module designed for custom presence setups, equipment retrofits, and specialized automation interfaces. Rather than employing built-in PIR or optical elements, the Plus Uni provides dual potential-free dry contacts, analog inputs, and digital sensor interfaces operating across 8 to 24 VAC, 9 to 28 VDC, or fixed 5 VDC power supplies. This allows systems integrators to transform conventional wired reed switches, beam-break vehicle sensors, or legacy security panel zone loops into responsive Wi-Fi smart endpoints.

Measuring 1.46 by 1.65 by 0.63 inches and weighing a mere 0.3 ounces, the module tucks directly inside the electrical enclosures of gate motors, garage door openers, or old-school analog intercoms. Once connected to 2.4 GHz Wi-Fi, the Plus Uni acts as a functional presence bridge, reporting real-time gate latch states via external reed switches while retaining the capacity to trigger dry-contact momentary button presses. Furthermore, the embedded firmware allows the module to act as a Wi-Fi range extender, reinforcing RF coverage for edge devices in detached zones.

Control integration is universally open, providing native interoperability with Home Assistant, Google Home, Amazon Alexa, and Samsung SmartThings over local IP networks. By eliminating the necessity for battery replacements through continuous low-voltage circuit tapping, the Plus Uni serves as the ultimate bridge for permanent industrial, vehicular, and physical presence sensing projects.

• Universal low-voltage power input accepting 8-24 VAC, 9-28 VDC, or 5 VDC
• Dual potential-free dry contacts for interfacing with existing hardware
• Onboard Wi-Fi range extender functionality to amplify local signal coverage
• Integrated digital and analog inputs compatible with external reed switches