Nestool SQ400C Smart Water Leak Detector: Instant smartphone alerts without hub
For the homeowner who wants to prevent costly water damage, this smart water leak detector is your first line of defense. It’s perfect for placing under a basement water heater or behind a washing machine, giving you peace of mind even when you’re away on vacation. Instead of just reacting to leaks, it helps you avoid the stress and expense of major repairs by alerting you the instant moisture is detected.
You’ll get an immediate push notification to your phone through the Tuya Smart app, and the 100dB alarm is loud enough to hear from another room—like when it’s tucked under the kitchen sink. The adjustable volume lets you set it high for noisy areas or lower for quiet spaces, and the included extended probe reaches into tight spots. With up to a year of battery life and low-battery alerts, it’s a reliable, wireless solution that works with Alexa for easy voice control. Mute the alarm right from the app once you’ve handled the leak, keeping your home secure without disruption.
Features
- 100dB loud alarm with adjustable volume
- Versatile placement for whole-home protection
- Ultra-low battery consumption with reminders
- Smart integration with Alexa and Google Assistant
- Easy mute from device or app
- Instant smartphone alerts without hub
General specs
- Brand: Nestool
- Model: SQ400C
- Seller: Amazon
- ID: B0FRB4ZRPF
- Material: Plastic
- Alarm Type: Light, Sound
- Dimensions: 63.5, 25.4, 63.5
- Item Weight: 85
- Sound Level: 100
- Connectivity: Wi-Fi
- Hub Required: No
- Power Source: Battery
- Detection Type: Water Leak
- Sensors Included: 1
- Notification Type: App Notification
- Batteries Included: No
- Smart Home Compatibility: Amazon Alexa, Google Home, Tuya Smart
- First listed by seller: 11/9/25
If you are interested in more details, you can find full information on the seller's page.
Buy on Amazon
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Price History for seller Amazon
| Date | Price |
|---|---|
| 12/6/25 | $16.49 |
| 11/9/25 | $19.99 |
Shipping options
United States
Comparison with similar products
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Nestool SQ400C White Instant smartphone alerts without hub
|
SwitchBot W4402010 White Real-time app and email alerts
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Govee H5040+H5054 White Real-time alerts via email and app notifications
|
Moen 920-005 White Real-time smartphone notifications via app
|
X-Sense SWS54 Gray Real-time phone notifications for water leaks
|
METAK WD60
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| Brand | Nestool | SwitchBot | Govee | Moen | X-Sense | METAK |
| Model | SQ400C | W4402010 | H5040+H5054 | 920-005 | SWS54 | WD60 |
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| Price | $16.49 | $16.99 | $32.92 | $116.11 | $52.62 | $39.99 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | December 6, 2025 | December 6, 2025 | December 6, 2025 | December 6, 2025 | December 6, 2025 | December 6, 2025 |
| Material | Plastic | ABS | Plastic | Plastic | Plastic | ABS |
| Alarm Type | Light, Sound | Sound | Sound | Sound | ||
| Dimensions | 63.5, 25.4, 63.5 | 44.96, 26.42, <num_z> | 38.1, 82.55, 66.8 | 79, 29, 79 | 1.96 x 1.06 x 3.22 inches | |
| Item Weight | 85 | 68 | <num1>, <num2> | 363 | <num1>, <num2> | |
| Sound Level | 100 | 100 | 100 | 110 | ||
| Connectivity | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi | ||
| Hub Required | No | No | No | No | Yes | |
| Power Source | Battery | Battery | Battery | Battery | ||
| Detection Type | Water Leak | Water Leak, Water Level | Water Leak | Water Leak | Water Leak | |
| Sensors Included | 1 | 1 | 3 | 3 | 3 | |
| Notification Type | App Notification | App Notification | App Notification | App Notification | App Notification | |
| Batteries Included | No | Yes | Yes | Yes | ||
| Smart Home Compatibility | Amazon Alexa, Google Home, Tuya Smart | Amazon Alexa, Google Home | Amazon Alexa, Google Home | Moen Smart Water Network App | Amazon Alexa, Google Home | |
| IP Rating | IP67 | IP67 | IP66 | |||
| Battery Type | Alkaline | Alkaline | Alkaline | Alkaline | ||