PIR vs Radar Presence

PIR sensors detect body heat moving across their view, run for years on batteries and suit hallways and entrances. Radar and mmWave sensors detect tiny movements, so they know someone is still in the room, but they need USB power.

Built-In Light Sensor

A lux sensor lets automations turn lights on only when the room is actually dark, which saves energy and avoids lights snapping on in daylight. Hue, Aqara P1, SNZB-03PR2, Shelly and both SONOFF presence sensors include one.

Timeout & Sensitivity

Short re-trigger times keep lights responsive in busy hallways, while adjustable sensitivity avoids false triggers from pets or heaters. How much you can tune depends on both the sensor and your hub’s driver.

Battery & Placement

AAA and AA cells are cheap and easy to replace; CR2477 coin cells last longest. Magnetic or ball mounts make it easy to aim the sensor at doorways rather than windows, which reduces false triggers.

Hub Compatibility

SONOFF, THIRDREALITY and Aeotec sensors are standard Zigbee 3.0 devices for most hubs. Hue and Aqara officially require their own hubs, though Home Assistant, Hubitat and SmartThings support them through community drivers.

The Aqara P1 is the motion sensor for people who like to tune things. Its detection timeout can be adjusted, it reports a light level for darkness-aware automations, and Aqara claims up to five years of battery life. Aqara’s listing says it requires an Aqara Zigbee hub, but the P1 is popular in Home Assistant and Zigbee2MQTT, where its settings are exposed. Keep it close to reliable routers, as Aqara sensors can be fussy about which routers they stay with. Amazon showed very limited stock when we checked.

THIRDREALITY’s Zigbee Motion Sensor 2-pack is one of the cheapest ways to cover multiple rooms. It is a standard Zigbee 3.0 sensor that works with Echo devices that have a built-in Zigbee hub as well as open hubs, and THIRDREALITY markets it as pet friendly to reduce false triggers from small animals. It runs on two AAA batteries that THIRDREALITY says last up to two years. The 2-pack has around 400 ratings and the single unit more than 1,200, averaging around 4 stars.

The SNZB-03P is SONOFF’s budget workhorse. It uses a large CR2477 cell that SONOFF says lasts over three years, reacts quickly to motion, and works as a standard Zigbee 3.0 sensor with SONOFF bridges, Echo hubs, SmartThings, Hubitat and Home Assistant. It lacks a light sensor and fine-grained tuning, but at its price you can put one in every closet, hallway and garage.

SONOFF’s second-generation SNZB-03PR2 adds the feature the original lacked: a built-in light sensor that reports real-time lux with calibration, so lights only turn on when it’s dark. SONOFF also lets you choose shorter re-trigger intervals for busy hallways and stairs, and the lux reading can drive scenes on its own. It is a newer model with about 150 ratings averaging under 4 stars, so early firmware quirks are possible; check your hub’s support for this revision.

THIRDREALITY’s R1 lets you set sensitivity with buttons on the sensor itself, no app needed, which makes it easy to match a small bathroom or a big open room. It runs on AA batteries, supports over-the-air updates and lets you customize the cool-down time between triggers. THIRDREALITY lists Home Assistant, SmartThings, Homey, Hubitat and Echo hubs. It has around 135 ratings averaging about 3.8 stars.

Most Zigbee motion sensors are indoor-only. The Hue Outdoor Motion Sensor is built for porches, driveways and gardens, with a large 160-degree detection view and automatic dusk-to-dawn behavior, so outdoor and indoor Hue lights turn on only after dark. Like the indoor model it officially requires a Hue Bridge, and it is also supported by Home Assistant. It has more than 460 ratings at around 4.4 stars, and it is the most proven outdoor Zigbee motion sensor on Amazon.

Shelly’s BLU Motion ZB is a compact battery-powered motion and light sensor with a twist: it speaks both Zigbee and Bluetooth. Pair it to a Zigbee hub like any other sensor, or use it over Bluetooth with Shelly gateways and Shelly Smart Control, and it integrates with Home Assistant either way. That flexibility is great if you already run Shelly relays. It is a newer product with fewer than 60 ratings, averaging around 4.4 stars.

The SNZB-06P uses 5.8 GHz microwave radar to detect people even when they are sitting still at a desk or on the sofa, and a built-in light detector keeps the lights off in daylight. Being USB powered, it also works as a Zigbee router. It has nearly 500 ratings at around 4 stars. Radar can see through thin walls and react to fans or curtains, so plan to adjust sensitivity and placement.

The SNZB-06P24 steps up to 24 GHz mmWave radar, which detects small movements like breathing more precisely than the 5.8 GHz model and is generally less prone to seeing through walls. It adds a calibrated light sensor with history, so you can automate lighting based on both presence and brightness. It has around 200 ratings averaging under 4 stars, so expect to spend a little time tuning sensitivity.

Aqara’s FP1E is a refined mmWave presence sensor that uses AI-enhanced processing to tell real occupants from noise, aiming for fewer false triggers than budget radar sensors. It runs on Zigbee 3.0 and USB power. Aqara says an Aqara Zigbee hub is required (with Matter available through those hubs), while the FP1E is also community-supported in Home Assistant. The US listing had only a handful of ratings when we checked.

SmartThings, Hubitat or mixed hubs?

Start with the Aeotec SmartThings Motion Sensor for broad, reliable compatibility.

Philips Hue lights?

The Hue Motion Sensor indoors and the Hue Outdoor Motion Sensor for porches and driveways.

Covering many rooms cheaply?

SONOFF SNZB-03P or the THIRDREALITY 2-pack; add the SNZB-03PR2 where you need a light sensor.

Lights keep turning off on you?

Switch to presence: SNZB-06P on a budget, SNZB-06P24 for mmWave, FP1E for premium accuracy.

Home Assistant tinkerer?

The Aqara P1 exposes the most settings; the Shelly BLU Motion ZB adds Bluetooth flexibility.

Awkward room sizes?

The THIRDREALITY R1 lets you set sensitivity right on the device.

What’s the difference between a motion sensor and a presence sensor?

A PIR motion sensor detects body heat moving across its view, so it reports “no motion” when you sit still and your lights may turn off. A presence sensor uses radar or mmWave to detect very small movements such as breathing, so it knows you’re still in the room. Use PIR for hallways and entrances, and presence sensors where people sit, work or bathe.

Do Hue and Aqara motion sensors work with Home Assistant?

Yes, in practice. Philips Hue officially requires a Hue Bridge and Aqara officially requires an Aqara hub, but both brands’ motion sensors are widely used with Home Assistant (ZHA and Zigbee2MQTT) and Hubitat. You can also keep them on their own hub and bring them into Home Assistant through the Hue integration or Matter.

Where should I mount a Zigbee motion sensor?

Aim PIR sensors across the path people walk, such as across a doorway rather than straight at it, at about 2 m high. Avoid pointing them at windows, heaters or air vents, which cause false triggers. Mount presence sensors facing the area where people sit, and keep them away from ceiling fans and moving curtains.

Will a motion sensor work with Alexa’s built-in Zigbee hub?

Most standard Zigbee 3.0 motion sensors, including THIRDREALITY and SONOFF models, pair with Echo devices that have a built-in Zigbee hub and can trigger Alexa routines. Advanced settings like timeout or sensitivity usually aren’t adjustable through Alexa, and brand-locked sensors (Hue, Aqara) may not pair. Our best Zigbee hubs guide compares the options.

Zigbee, Z-Wave or Matter motion sensors?

Zigbee sensors are the cheapest and most widely available and work with the hub you likely already have. Z-Wave sensors avoid 2.4 GHz Wi-Fi interference and suit security panels; see our best Z-Wave motion sensors. Matter sensors work across Apple, Google and Amazon without a vendor hub; see our best Matter motion sensors.