35% OFF
$19.39
$29.99
Updated November 2026
Data from the official Arlo and TP-Link sites.
2026 verdict
A sealed body and a siren on the sensor beat a broader sensor set here, and the Tapo T300 is the better water leak sensor of the pair.
It undercuts the Arlo All-in-One Sensor on price, carries the higher owner rating, is IP67 sealed, and adds a 90 dB alarm with an alert light, reaching Google Home and partial Home Assistant through a Tapo Hub. The Arlo All-in-One Sensor answers with tilt detection and a temperature and freeze alert set, plus Google Home, Alexa and SmartThings through the Arlo system. Pick the Tapo for a loud, well-sealed spot sensor, the Arlo if you already own an Arlo Security System and want tilt.
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Winner
15% OFF
$16.99
$19.99
Also sold in packs
- Pack of 222% OFF£35.98£45.98£17.99 per unitBuy
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| Feature | Arlo All-in-One Sensor | Tapo T300 | Winner |
|---|---|---|---|
| Price | $19.39 | $16.99 | Tapo T300 |
| Rating | 4.1 | 4.6 | Tapo T300 |
| Weather Resistance | NO | IP67 | Tapo T300 |
| Integrations | Google Home, Alexa, Samsung SmartThings | Google Home, Home Assistant | Arlo All-in-One Sensor |
| Sensors | Water Leak, Temperature, Tilt | Water Leak | Arlo All-in-One Sensor |
| Alerts | Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts | Water Leak Alerts, Low Battery Alerts | Arlo All-in-One Sensor |
| On Device Alert Sound | NO | YES | Tapo T300 |
| On Device Alert Light | NO | YES | Tapo T300 |
| Warranty | 1 year | 1 year | Tie |
| Connectivity | Other | Other | Tie |
What the differences mean
On-device alarm
The Tapo T300 has a 90 dB siren and an alert light on the unit, while the Arlo All-in-One Sensor has neither a sound nor a light and warns only through the app. In a basement or a closed utility room, that local siren is what you hear first.
Sealing
The Tapo T300 is rated IP67 and survives splashes and a shallow puddle, while the Arlo All-in-One Sensor carries no weather-resistance rating. Both belong indoors, but only the Tapo is sealed against water reaching the unit.
Sensing
The Arlo All-in-One Sensor adds tilt detection and reports temperature and freeze, while the Tapo T300 detects water only. If a knocked-over object or a cold snap is part of the risk, the Arlo covers more.
Ecosystem
The Arlo All-in-One Sensor needs an Arlo Security System but then reaches Google Home, Alexa and SmartThings. The Tapo T300 needs a Tapo Hub and reaches Google Home and partial Home Assistant, and it does not support Alexa.
Battery
The Tapo T300 is rated for about three years on two AAA cells, while the Arlo All-in-One Sensor uses a CR2477 coin cell with no documented life. The Tapo gives the clearer expectation of how long it lasts.
Price and rating
The Tapo T300 is the lower priced of the two and the better rated by owners. The Arlo All-in-One Sensor sits higher and its value depends on already owning the Arlo hub it requires.
Which one to buy if
- you want an alarm that sounds in the room
The Tapo T300 has a 90 dB siren and a light; the Arlo All-in-One Sensor is silent on the unit.
- you want tilt and temperature sensing too
The Arlo All-in-One Sensor adds tilt detection and temperature and freeze alerts the Tapo T300 lacks.
- you already own an Arlo Security System
The Arlo All-in-One Sensor slots into the Arlo app and automations you already use.
- the sensor may get splashed under a sink
The Tapo T300 is IP67 sealed, while the Arlo All-in-One Sensor has no weather-resistance rating.
- you already own a Tapo Hub
The Tapo T300 pairs in minutes and works alongside your other Tapo devices.
35% OFF
$19.39
$29.99
- + Integrations: Google Home, Alexa, Samsung SmartThings
- + Sensors: Water Leak, Temperature, Tilt
- + Alerts: Water Leak Alerts, Temperature Alerts, Freeze Temperature Alerts
- - Price: $19.39 vs $16.99
- - Rating: 4.1 vs 4.6
Winner
15% OFF
$16.99
$19.99
- + Price: $16.99
- + Rating: 4.6
- + Weather Resistance: IP67
- - Integrations: Google Home, Home Assistant vs Google Home, Alexa, Samsung SmartThings
- - Sensors: Water Leak vs Water Leak, Temperature, Tilt
What owners say
Owners of both sensors report quick setup and a leak caught early, and neither group complains about the core detection. Tapo T300 owners highlight the loud 90 dB alarm, the sensitivity to water from the top and the bottom, and how smoothly it fits into the Tapo app alongside other devices, though several were surprised by the mandatory Tapo Hub and a few outside the US hit a sensor and hub mismatch. Arlo All-in-One Sensor owners appreciate the small, multi-sensor puck and its easy pairing in the Arlo app, but a minority report inconsistent battery life and occasional false status flags after months of use.
Frequently Asked Questions
Which is better overall: Arlo All-in-One Sensor or Tapo T300?
For most single spots the Tapo T300, on price, owner rating, IP67 sealing and its 90 dB siren plus light. The Arlo All-in-One Sensor wins when you already own an Arlo Security System and want tilt and temperature sensing in the same unit.
What is the biggest difference between the Arlo All-in-One Sensor and the Tapo T300?
Alerts against sensors. The Tapo T300 alerts loudly on the device and is IP67 sealed, while the Arlo All-in-One Sensor is silent on the unit but adds tilt detection and temperature and freeze alerts.
Does the Tapo T300 work with Alexa?
No. The Tapo T300 lists Google Home and partial Home Assistant but not Alexa, Apple Home, SmartThings or Matter. The Arlo All-in-One Sensor does support Alexa, along with Google Home and SmartThings.
Which sensor needs a hub, the Arlo All-in-One Sensor or the Tapo T300?
Both do. The Arlo All-in-One Sensor requires an Arlo Security System, and the Tapo T300 requires a Tapo Hub over Sub-1G. Neither connects directly to Wi-Fi.
Who should buy the Arlo All-in-One Sensor, and who should buy the Tapo T300?
Buy the Arlo All-in-One Sensor if you own an Arlo Security System and want leak, temperature and tilt coverage. Buy the Tapo T300 for a sealed spot sensor with a loud local alarm if you run or will add a Tapo Hub.
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