Ubiquiti Environmental Sensor
Water, temperature, humidity, ambient lightSuperLink; Gateway required1 × 3 V CR123A battery, includedIPX5; not for immersion
The Ubiquiti USL-Environmental is a white, battery-powered connected-building sensor that detects water leaks, temperature, humidity and ambient light. It communicates over proprietary SuperLink and requires a separate SuperLink Gateway and UniFi Protect system; an optional external water-leak probe is sold separately.
Best For: Suitable for monitoring water leaks and ambient conditions in a connected building where a SuperLink Gateway and UniFi Protect system are already available or can be added. It is not an entry, glass-break, smoke or CO detector, camera, gateway or water shutoff valve.
Before you order: A separate SuperLink Gateway and UniFi Protect web or mobile system are required. The external water-leak probe is optional and not included. The CR123A battery and mounting items are included. IPX5 does not mean immersion protection, guarantee flood prevention or provide automatic water shutoff; the stated 2 km range and up-to-6-year battery life depend on deployment, environment and use.
What's in the Box
- One Ubiquiti Environmental Sensor
- One CR123A battery
- Mounting plate and adhesive mounting items
- Two M3 screws and two wall plugs
- Opening tool
What It Means in Practice
- The guide shows floor placement to expose the built-in water contacts, as well as magnet attachment or adhesive/screw mounting of the plate.
- The 3.5 mm AUX TRS/TS jack is for an optional water-leak probe, not audio; the probe and its cable are not included.
- Plan for a separate SuperLink Gateway and UniFi Protect web or iOS/Android system. The sensor itself uses one included 3 V CR123A battery and does not require mains or PoE power.
- Keep the sensor within −20 to 40 °C and 10–90% non-condensing humidity. IPX5 is not immersion protection.
What Will Not Work
- A separate SuperLink Gateway and UniFi Protect system are required; the sensor communicates through proprietary SuperLink.
- The optional external water-leak probe is not included; the 3.5 mm jack is not an audio connection.
- IPX5 does not protect against immersion. The sensor does not guarantee flood prevention or automatically shut off water.
- The 2 km range and up-to-6-year battery life are conditional maximum figures, not guaranteed results.
Key Features
Four sensing functions
Built-in contacts detect water leaks, alongside temperature, humidity and ambient-light sensing.
Optional probe connection
A 3.5 mm AUX TRS/TS jack accepts a separately supplied external water-leak probe.
Flexible placement
The guide shows floor placement, magnet attachment, or adhesive and screw mounting.
Battery powered
Uses one included 3 V CR123A battery; stated life is up to 6 years depending on use and environment.
Technical Specifications
| Manufacturer | Ubiquiti |
| Model | Environmental Sensor |
| Manufacturer SKU | USL-Environmental |
| Sensing | Water leaks via built-in contacts; temperature; humidity; ambient light |
| External probe connection | 3.5 mm AUX TRS/TS jack for optional water-leak probe; not an audio jack |
| Wireless connectivity | Proprietary SuperLink; separate SuperLink Gateway required |
| Regional operating frequencies | EU: 865.1–869.5 MHz | US: 915.6–927.6 MHz | Japan: 920.5–922.3 MHz; regional specifications, not a universal selectable range |
| Antenna gain | 0 dBi |
| Maximum transmit power | 14 dBm |
| Maximum wireless range | Up to 2 km, conditional on deployment and environment |
| System and app requirement | UniFi Protect web application or iOS/Android app |
| Battery | One 3 V CR123A lithium battery, included |
| Maximum battery life | Up to 6 years, depending on use and environment |
| Maximum power consumption | 34.9 mW |
| Dimensions | Sensor: 53 × 49 × 23.5 mm | Mount: 41.3 × 36.6 × 3.1 mm |
| Weight | Sensor: 47.8 g | With mount: 70 g |
| Enclosure material | Polycarbonate |
| Mount material | Galvanised steel |
| Mounting options | Adhesive, magnet or screws; guide also shows floor placement to expose water contacts |
| Water resistance | IPX5; not protection against immersion |
| Operating temperature | −20 to 40 °C |
| Operating humidity | 10–90% non-condensing |
| Buttons | Factory reset and function |
| Status indicators | Status LED: red/blue/white | Signal LED: blue/red |
| Certifications | FCC, IC, CE |
| NDAA compliant | Yes |
Frequently Asked Questions
What is required to use the sensor?
A separate SuperLink Gateway and UniFi Protect system are required, with web or iOS/Android app access.
Is an external water-leak probe included?
No. The optional probe is sold separately. The sensor has built-in water contacts, and its 3.5 mm AUX TRS/TS jack is for the external probe, not audio.
What comes with the sensor?
One sensor, one CR123A battery, mounting plate and adhesive mounting items, two M3 screws, two wall plugs and an opening tool.
Can it prevent flooding or be immersed?
No. IPX5 is not immersion protection, and the sensor does not guarantee flood prevention or automatically shut off water.
Singular Expert Insight
One sensor combines built-in water-leak contacts with temperature, humidity and ambient-light sensing. The optional 3.5 mm connection supports a separately purchased external water-leak probe when additional probe-based detection is needed.
Buyer’s Guide
✓ Buy it if Suitable for monitoring water leaks and ambient conditions in a connected building where a SuperLink Gateway and UniFi Protect system are already available or can be added. It is not an entry, glass-break, smoke or CO detector, camera, gateway or water shutoff valve.
✕ Skip it if A separate SuperLink Gateway and UniFi Protect web or mobile system are required. The external water-leak probe is optional and not included. The CR123A battery and mounting items are included. IPX5 does not mean immersion protection, guarantee flood prevention or provide automatic water shutoff; the stated 2 km range and up-to-6-year battery life depend on deployment, environment and use.