Shelly
Shelly Plus Uni
- Native integration
- Local control
- Wi-Fi
- Bluetooth
Prices verified September 2026
See more relays & dimmer modules picks on our Amazon storefront →Our verdict
The odd-jobs module: two low-voltage inputs and two potential-free relay outputs (30V, 300mA max) for wiring into garage door openers, boiler interlocks, doorbell chimes, underfloor heating actuators, or any low-voltage circuit a mains relay can't touch. Don't mistake this for a parasitically-powered add-on — at 40 x 21 x 7mm it's tiny enough to tuck inside a garage opener's housing, but it still needs its own 8-24V AC/9-28V DC (or 5V DC) supply wired in separately from whatever low-voltage circuit it's monitoring or switching. Fully local via HA's core Shelly integration — the one to keep in a drawer for whatever project comes next.
What can Home Assistant control on the Shelly Plus Uni?
| Control | Type | What it does |
|---|---|---|
| Relay 1 | Switch | Potential-free relay output; momentary/pulse mode wires directly into a garage opener's push-button terminals to simulate a button press. |
| Relay 2 | Switch | Second independent potential-free relay, e.g. for a boiler interlock or doorbell chime circuit. |
| Input 1 | Binary sensor / analog sensor | Low-voltage input configurable as a digital contact or an analog voltage reading. |
| Input 2 | Binary sensor / analog sensor | Second low-voltage input, independently configurable as digital or analog; commonly paired with Input 1 for two-sensor setups like separate open and closed reed switches. |
| Garage door cover | Cover (template) | Not exposed natively — built in HA by pairing a relay switch (pulse trigger) with an input binary sensor (reed switch) via a template cover. |
Each relay and each input surfaces as its own entity in HA — two independent switch entities for the outputs, two independent binary sensor entities for the inputs — and either input can be reconfigured in the Shelly app as a dry-contact digital sensor or an analog voltage channel, useful for reading a resistive or voltage-output sensor instead of a switch closure. The Uni has no native cover entity, so a garage door setup means hand-building a template cover: the relay switch fires a momentary pulse into the opener's existing button-press terminals while a reed switch on the other input feeds the binary sensor for open/closed state. A recurring gotcha is Shelly's own input-to-relay auto-off linkage — leaving an input still associated with its paired relay in the device's local settings can make the binary sensor's state get silently overwritten when the relay times out, so the input needs to be detached from relay control before it holds accurate door-position state in HA.
Specs
| inputs | 2 |
|---|---|
| weight | 8.5g with cables |
| channels | 2 |
| use case | low-voltage relay/input, e.g. garage doors, boiler interlocks |
| dimensions | 40 x 21 x 7mm (±0.5mm) |
| output type | potential-free (dry contact) solid-state relay |
| power supply | 8-24V AC / 9-28V DC, or 5V DC (stabilized) — a separate supply from the low-voltage circuit it's controlling or reading |
| max switching | 30V, 300mA per relay |
| operating temp | -20°C to 40°C |
| neutral required | false |
| power consumption | under 1W |
How does the Shelly Plus Uni compare?
| Product | From | Protocol | Local control | Integration |
|---|---|---|---|---|
| Shelly Plus Uni (this product) | £16.99 | Wi-Fi, Bluetooth | Yes | Native |
| Aqara Dual Relay Module T2 | £29.74 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Aqara Single Switch Module T1 (No Neutral) | £26.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
| Candeo Zigbee Dimmer Module (C-ZB-DM204) | £39.99 | Zigbee | Yes | Zigbee2MQTT / ZHA |
Frequently asked questions
- Does the Shelly Plus Uni work with Home Assistant locally?
- Yes. The Shelly Plus Uni is controlled locally in Home Assistant through a built-in Home Assistant core integration (shelly), so it keeps working if your internet connection or the Shelly cloud goes down. Control and state updates stay on your own network.
- Which protocol does the Shelly Plus Uni use, and do I need a hub?
- The Shelly Plus Uni uses Wi-Fi and Bluetooth. To pair it with Home Assistant you need no hub — it joins your Wi-Fi network directly; or a Bluetooth adapter on your Home Assistant host or an ESPHome Bluetooth proxy. Shelly's own hub is not required when you integrate through a built-in Home Assistant core integration (shelly).
- How much does the Shelly Plus Uni cost in the UK?
- The lowest price we have listed for the Shelly Plus Uni is £16.99 at Shelly Store UK. Prices were last checked in September 2026 and change often, so confirm on the retailer's page before buying.