ConBee II – Universal Zigbee 3.0 USB Gateway: The Cheap Hub That Frees Your Smart Home

The ConBee II is a small USB stick that turns a computer into a Zigbee coordinator, letting Home Assistant, ioBroker, deCONZ or Zigbee2MQTT talk to sensors, switches and bulbs directly. It is aimed at tinkerers and self-hosters who want local control instead of a vendor cloud, and it is the cheapest way into that workflow. This review covers what the stick does, how it fits into a home automation setup, where it falls short and who should skip it. The short version: if a home server is already running, this is the obvious first Zigbee purchase.

Features and Specifications

Type: Universal Zigbee 3.0 USB gateway (coordinator stick)
Connection: USB to the host computer
Software Included: deCONZ and Phoscon App
Compatible Platforms: Home Assistant, ioBroker, Zigbee2MQTT
Protocol: Zigbee 3.0
Form Factor: Compact USB dongle

The headline here is the protocol. Zigbee 3.0 is the current generation of the standard, and it is what lets one stick speak to devices across brands rather than locking a household into a single ecosystem. A buyer who has accumulated a mix of Zigbee gear from different manufacturers gets one radio that can coordinate all of it.

The second headline is the software bundle. deCONZ and the Phoscon App ship with the stick, which means a buyer can get a working Zigbee network running without buying anything else. Phoscon is the friendlier front end; deCONZ is the underlying engine that more advanced platforms hook into.

The USB form factor matters more than it looks. Because the ConBee II is a dongle and not a standalone hub, it has no Wi-Fi radio, no cloud account and no app store of its own. All the intelligence lives on the computer it is plugged into, which is exactly the point for the audience this product targets.

Build and Hardware

The ConBee II is a bare USB stick, and that dictates how it gets used. It plugs into a USB port on a always-on machine — a Raspberry Pi, a mini PC, a NAS with USB — and stays there. There is no screen, no button and no separate power supply, so the host computer is the single point of failure for the whole Zigbee network.

That simplicity is the appeal. A dedicated hub is another box to power, another account to create and another firmware update to babysit. The ConBee II removes all of that and hands coordination to software the buyer already trusts.

The trade-off is placement. A USB stick sits wherever the host computer sits, and that is rarely the middle of a house. Buyers with a server in a basement or a closet should plan on a USB extension cable to get the radio out in the open, away from the metal of a case and the interference of other electronics.

Trade-off: The stick is only as reliable as the machine it is plugged into, so a host that reboots, sleeps or loses power takes the entire Zigbee network down with it.

Capacity and Device Support

Zigbee 3.0 support is the reason to choose this over an older coordinator. The standard is backward compatible with earlier Zigbee devices, so a mix of older sensors and newer bulbs can share one network, and devices from different vendors can relay for each other rather than forming isolated islands.

The practical ceiling depends on the host and the software stack, not on the stick alone. A modest setup — a couple of dozen sensors, a handful of bulbs, a few smart plugs — is well within what a Zigbee coordinator of this class handles. Buyers planning a very large deployment should treat the ConBee II as the entry point and expect to add mains-powered Zigbee devices to strengthen the mesh.

Mains-powered devices matter here. Battery sensors do not relay traffic; plugs, bulbs and switches do. A network built mostly from battery contact sensors will be thin and slow to respond, while one seeded with a few always-on devices gets noticeably more dependable.

Power and Host Requirements

The ConBee II draws its power from the USB port, so there is no adapter to buy and no battery to change. That keeps the bill of materials low, but it also means the host must supply a stable port — an underpowered hub or a marginal Raspberry Pi power supply can cause dropouts that look like Zigbee problems.

The host also has to stay awake. A computer that sleeps to save power will take the Zigbee network offline with it, and a machine that reboots without restarting the deCONZ service will leave devices unreachable until someone notices. Buyers who want a set-and-forget hub should weigh that against the flexibility of a software-based coordinator.

Software choice is the other half of the equation. Home Assistant, ioBroker and Zigbee2MQTT are all supported, and each brings its own learning curve. The bundled deCONZ and Phoscon route is the gentlest start; Zigbee2MQTT is the more configurable path for buyers who like editing files.

Maintenance and Software Updates

Everything about this product is maintained through software. Firmware for the stick and updates for deCONZ arrive through the host, and the Phoscon App provides a web interface for pairing devices, checking the mesh and renaming entities. That is a real advantage over closed hubs, which often stop receiving updates when a vendor moves on.

It also means the buyer owns the maintenance. There is no support line to call when a device refuses to pair, and troubleshooting happens in forums and documentation. Buyers who enjoy that work get a flexible, long-lived coordinator; buyers who do not will find it frustrating.

Backups are worth mentioning because they are easy to forget. The network configuration lives on the host, so a drive failure can wipe months of pairing work unless the buyer has a backup routine in place. That is a caution about the category, not a flaw in the stick.

Trade-off: Setup and upkeep are entirely the buyer’s responsibility, and a poorly documented configuration can be painful to rebuild after a host failure.

Who It Suits and Who It Does Not

The ConBee II suits the buyer who already runs Home Assistant, ioBroker or a similar platform and wants local Zigbee control without a vendor cloud in the middle. It also suits the buyer who is starting from scratch and wants the cheapest credible entry into a self-hosted smart home.

It does not suit the buyer who wants an app, a plug and a working system in ten minutes. A standalone Zigbee hub with a polished app is the better fit there, even at several times the price. It also does not suit a household with no always-on computer, because the stick has nothing to plug into.

Renters and buyers who move often may still prefer it, since the whole setup travels with a laptop-sized host rather than a wall-mounted hub. The compact size helps here as well.

FAQ

1. What is the ConBee II used for?
   It is a USB Zigbee coordinator. Plugged into a computer, it lets software such as Home Assistant, ioBroker or Zigbee2MQTT control Zigbee sensors, bulbs, switches and plugs on a local network.

2. Does the ConBee II work with Home Assistant?
   Yes. Home Assistant is one of the platforms named for this product, and it can talk to the stick through the deCONZ integration or through Zigbee2MQTT.

3. Do I need a Raspberry Pi to use it?
   No specific host is required. Any always-on computer with a free USB port will do, including a Raspberry Pi, a mini PC or a NAS, as long as the chosen software runs on it.

4. Is the ConBee II a standalone hub?
   No. It has no Wi-Fi and no cloud service of its own. It depends on the host computer for power, processing and network access, so the host must stay running.

5. What is the difference between deCONZ and Zigbee2MQTT?
   Both are software that drives the stick. deCONZ with the Phoscon App is the bundled, friendlier option, while Zigbee2MQTT is a separate open-source project favored by buyers who want more configuration control.

6. Does it support Zigbee 3.0 devices?
   Yes. Zigbee 3.0 is the protocol named for this product, and the standard is designed to work with earlier Zigbee devices as well, which helps in mixed-brand homes.

7. Why does the stick need a USB extension cable?
   USB ports sit close to the computer’s metal case and other electronics, which can interfere with a Zigbee radio. Moving the dongle away on a short extension usually improves range and reliability.

8. Can it control devices from different brands?
   That is the point of a universal Zigbee 3.0 gateway. Devices that follow the standard can join the same network and relay for each other, rather than being tied to one vendor’s app.

9. Is the ConBee II worth it compared to a branded hub?
   For a self-hoster, yes — it is far cheaper and keeps control local. For a buyer who wants a polished app and no maintenance, a branded hub is the better buy despite the higher cost.

10. What happens to the Zigbee network if the host reboots?
    Devices drop offline until the host and the coordinator software come back up. A stable host, a reliable power supply and a service that starts on boot prevent most of these outages.

Bottom Line

The ConBee II – Universal Zigbee 3.0 USB Gateway is the right first Zigbee purchase for anyone already running a home server: cheap, open, Zigbee 3.0 and backed by deCONZ, Phoscon, Home Assistant, ioBroker and Zigbee2MQTT. Buyers who want a plug-and-play hub with an app should look elsewhere, and buyers with no always-on computer should fix that first. For everyone else, this is the low-cost, high-control way to start a local smart home. Check the current price on Amazon before ordering.