







💧 Stay dry, stay smart — water level monitoring redefined!
The YoLink LoRa Smart Water Level Monitoring Sensor is a wireless, battery-powered float switch alarm with an ultra-long-range LoRa connection (up to 1320 feet). Featuring a loud 105dB siren and smart app notifications (push, SMS, email), it offers versatile water level detection for sump pumps, tanks, toilets, and more. Easy DIY pendant mount installation and compatibility with Alexa, IFTTT, and Home Assistant make it a must-have for proactive water management. Requires YoLink Hub for operation.







| ASIN | B0C3KXCY8B |
| Batteries | 2 AAA batteries required. (included) |
| Batteries Required? | Yes |
| Batteries included? | Yes |
| Battery Cell Type | Alkaline |
| Battery description | Alkaline |
| Best Sellers Rank | 445,735 in DIY & Tools ( See Top 100 in DIY & Tools ) 164 in Water Detectors |
| Control method | App |
| Coverage | 1000 Feet(Open Air) |
| Customer Reviews | 4.2 4.2 out of 5 stars (159) |
| Date First Available | 10 Jun. 2023 |
| Included Components | Detector |
| Item Package Quantity | 1 |
| Item Weight | 240 g |
| Item model number | YS7904 |
| Item weight | 0.24 Kilograms |
| Manufacturer | YOSMART |
| Material | Plastic |
| Maximum range | 1320 Feet |
| Mounting type | pendant mount |
| Noise level | 105 Decibels |
| Number of batteries | 2 AAA batteries required. (included) |
| Part Number | YS7904-UC |
| Product Dimensions | 6.2 x 6.2 x 2.03 cm; 240 g |
| Sensor technology | Contact Sensor |
| Style | Without Hub |
| UPC | 810121540848 810121540565 |
| Usage | Amateur, Inside, Professional |
K**T
Good choice
Well made and easily installed. Works effectively and support service professional if required.
M**M
I bought this to monitor the water level in my Christmas tree stand, and it’s been perfect for that. It alerts me when the water gets low so I can refill it before the tree dries out—no more needles all over the floor. Setup was easy, alerts are reliable, and the LoRa range works great even with the tree not near my router. For a non-traditional use case, it’s worked flawlessly. Simple solution that actually does what it’s supposed to do.
B**R
This has been a great product for us. As we don’t have an auto filler for the pool, I was able to use this to warn if the pool level was low so we can fill the pool when needed. Using Alexa, we automated a routine to automatically turn the hose on when the water level is low. Also, I put the unit inside an electrical enclosure and drilled out a small hole for the level sensor. This keeps it protected from the elements.
M**Z
Great sensor
D**E
Wow! Love this brand. I already have some door sensors to prevent the kids sneaking out at night, and now added a high level sump pump sensor. Works like a charm, texts and alerts on my phone and the unit itself beeps in the basement. I would definitely recommend this product for many different applications.
K**.
Parfait pour avoir la tête tranquille et être averti en cas de panne de la pompe ! Je n'ai pas eu de problème avec ma pompe depuis l'achat, mais lors de mes tests les avertissements fonctionnaient bien!
Trustpilot
2 months ago
3 weeks ago