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Athom Human Presence Sensor

The Athom Human Presence Sensor is a compact mmWave radar occupancy sensor that ships with ESPHome, the open-source firmware platform, preinstalled. Where a PIR motion sensor sees only movement and marks a room empty the moment you sit still, millimeter-wave radar detects micro-movements like breathing and typing, so lights stay on while you are actually present. The hardware pairs an ESP32-class Wi-Fi microcontroller with an LD2410-family radar module, the same combination behind most of the DIY presence-detection builds in the Home Assistant community, except here it arrives assembled, cased, and flashed, typically for around twenty dollars.

Aqara Door and Window Sensor P2

The Aqara Door and Window Sensor P2 is a small Thread-based contact sensor that reports whether a door, window, drawer, or cabinet is open or closed. Unlike Aqara's older Zigbee sensors, the P2 speaks Matter over Thread natively, so it pairs directly with any Thread border router and Matter controller, an Apple TV 4K, HomePod, Home Assistant with a Thread radio, or a SmartThings hub, without ever touching an Aqara hub or the Aqara cloud. Pairing is a QR-code scan, and from that point everything runs on your local network.

SONOFF Zigbee 3.0 USB Dongle Plus

The SONOFF Zigbee 3.0 USB Dongle Plus, commonly known by its model name ZBDongle-P, is a USB Zigbee coordinator built around the Texas Instruments CC2652P radio chip with a +20 dBm power amplifier and an external SMA antenna. Plugged into a machine running Zigbee2MQTT or Home Assistant's ZHA integration, it becomes the brain of a fully local Zigbee network, pairing and controlling bulbs, sensors, switches, and plugs from hundreds of manufacturers without any proprietary hub, account, or cloud service involved.