Zigbee Explained

You'll see Zigbee mentioned on the box of half the smart bulbs and sensors in JB Hi-Fi, usually with no explanation of what it actually means. Here's the plain-English version, and why it needs a hub to do anything.

What Zigbee is

Zigbee is a low-power wireless networking protocol, purpose-built for small, battery-powered smart home devices — bulbs, sensors, plugs, switches — to talk to each other and to a central hub. It's not a brand, and it's not the same thing as Wi-Fi or Bluetooth, even though all three are radio protocols living in similar frequency bands. It was designed from the ground up around one priority: sipping as little power as possible so battery-powered sensors can last months or years on a coin cell, rather than needing frequent recharging like a Wi-Fi device would.

How it differs from Wi-Fi and Bluetooth

• Wi-Fi: high bandwidth, built for streaming video and large data transfers, but power-hungry — fine for a mains-powered bulb, poor for a battery sensor you want to last a year.
• Bluetooth: lower power than Wi-Fi, good for short-range direct connections (like a phone to a lock), but limited range and traditionally not great at forming large multi-device networks (though Bluetooth mesh has improved this).
• Zigbee: very low power, modest bandwidth (fine for simple on/off or sensor data, not for video), and — critically — forms a mesh network, where every mains-powered Zigbee device (like a smart bulb) acts as a relay/repeater for other devices' signals. This means the more Zigbee bulbs and plugs you add, the stronger and further-reaching your Zigbee network becomes, unlike Wi-Fi where more devices can mean more congestion.

Why it needs a hub

Zigbee devices don't speak directly to your phone or home Wi-Fi network — they speak Zigbee to each other and to a hub (also called a bridge or coordinator), which translates that traffic into something your app, or a platform like Home Assistant, can understand and control over your regular Wi-Fi or the internet. This is the single most common point of confusion for first-time buyers: a Zigbee bulb or sensor bought in isolation, with no hub, will not connect to your phone app at all — it's simply a "no signal" device until paired with a compatible bridge.

Why manufacturers still use it for battery devices

For anything that needs to run for months or years on a small battery — door/window sensors, motion sensors, battery-powered switches — Zigbee's low power draw is a genuine, measurable advantage over Wi-Fi. A Zigbee door sensor might last well over a year on a coin cell; the same sensor built on Wi-Fi would likely need recharging every few weeks. That's why you'll see Wi-Fi used for mains-powered gear like bulbs and plugs (where power isn't a constraint) far more often than for small battery sensors.

Zigbee and Matter

Matter, the newer cross-platform standard, was originally built primarily around Wi-Fi and Thread rather than Zigbee directly. Rather than Zigbee disappearing, though, the practical trend has been Zigbee devices bridging into Matter — a Zigbee hub (like a newer Hue Bridge) exposes its connected Zigbee devices to Matter-compatible apps, effectively giving Zigbee gear cross-ecosystem compatibility without the devices themselves needing to change protocol. For the full picture on that standard, see our Matter explainer.

Should it affect what you buy?

If you're buying a handful of mains-powered bulbs or plugs and don't plan to expand much, a simple Wi-Fi device with no hub is genuinely less hassle. If you're planning a bigger setup — several rooms, a mix of sensors, bulbs and switches, or you're building toward a platform like Home Assistant — Zigbee's mesh reliability and lower running cost (both in power and in not congesting your home Wi-Fi) make the one-off hub cost worth it. Check our smart lighting explainer and smart sensors explainer for how this plays out for specific device types.