Zigbee
A low-power wireless mesh protocol for smart home devices. Requires a hub but is more reliable and scalable than Wi-Fi — each device extends the network for others.
Zigbee is a wireless communication protocol designed specifically for smart home devices. It operates on the 2.4 GHz band (same as Wi-Fi) but uses far less power — a Zigbee device can run for years on a coin cell battery, while a Wi-Fi device needs constant mains power.
The defining feature of Zigbee is mesh networking. Every mains-powered Zigbee device (like a smart bulb or plug) acts as a signal repeater, passing messages along to other devices. The more Zigbee devices you add, the stronger and more reliable your network becomes. This is the opposite of Wi-Fi, where more devices strain the router.
The trade-off is that Zigbee requires a hub — a dedicated bridge device like the Philips Hue Bridge, SmartThings Hub, or Amazon Echo with Zigbee built in. The hub translates between the Zigbee mesh and your home network. This adds upfront cost and a single point of failure, but it also means your smart lights work locally — even if your internet goes down, the hub can still control everything.
Specifications
| Frequency | 2.4 GHz |
| Range | 10-20m per hop (mesh extends) |
| Hub required | Yes (Hue Bridge, SmartThings, etc.) |
| Max devices | 65,000+ per network |
Related Terms
- Z-Wave
A smart home mesh protocol operating on sub-1GHz frequencies, avoiding Wi-Fi interference. Requires a hub and supports up to 232 devices per network.
- Thread
A modern IP-based mesh networking protocol for smart home devices. Low-power like Zigbee but uses internet protocol natively — a foundation for Matter.
- Matter
A unified smart home standard backed by Apple, Google, Amazon, and Samsung. Devices certified for Matter work across all major ecosystems — ending the 'which app?' problem.
- Smart Hub
A central device that bridges smart home protocols (Zigbee, Z-Wave) to your home network. Required for some smart lights, optional for Wi-Fi bulbs.