Unboxing Meross MS405 Water Leak Sensor, the Ultimate Leak Protection
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Meet Meross MS405 Smart Water Leak Sensor
The Meross MS405 Smart Water Leak Sensor Kit arrives in a compact, eco-friendly box with clean branding and clear labeling of its top features. Setup was a breeze—within minutes, I had the hub connected to power and the Meross app installed. The app automatically detected the hub, and pairing the sensor was seamless. The build quality impressed me right away. The sensor has a solid, water-tight body (IP66 rated) and dual metal contact probes on both top and bottom—ready to catch leaks from any direction.
I was particularly impressed by the 433 MHz Sub-GHz wireless range. In my home, it easily reached the far end of the basement—where regular Wi-Fi devices often struggle. This makes it ideal for hard-to-reach places like crawl spaces, garages, or rental properties with thick walls. Running on two standard AAA batteries, Meross claims a 3-year lifespan. While I obviously haven’t tested that timeframe yet, after a week of use and a few triggered alarms, the battery level hasn’t budged. The sensor also enters a low-power mode automatically when idle, extending longevity. The Meross app is clean, intuitive, and logs every incident in detail. It tracks date/time, location, and whether it was a resolved or ongoing event. This kind of tracking is gold for insurance claims or long-term maintenance.
The Meross MS405 Smart Water Leak Sensor Kit is a must-have for any smart home, landlord, or safety-conscious homeowner. It’s quick to set up, precise in its detection, loud in its alerts, and reliable even in far corners of the house. The app delivers peace of mind wherever you are, and smart integrations take it to the next level.
If you’ve ever dealt with a water leak, you know the damage adds up fast. For just a small investment, the Meross MS405 gives you a high-tech shield against household disasters. It’s smart, robust, and dependable. I’ll be ordering a few more for my parents’ house and the vacation cabin. Highly recommended for anyone who wants round-the-clock water leak protection—with real smart home power.
Pros:
✔ Instant leak detection from top and bottom
✔ Extremely loud and dual alarm system
✔ Works with all major smart ecosystems
✔ Reliable long-range Sub-GHz connection
✔ Long battery life and waterproof casing
Cons:
➖ No temperature or humidity sensor (would be a nice bonus)
Meross MS405 Smart Water Leak Sensor Highlights
Customizable Buttons
Vibration-Triggered Backlight
Light Sensing
Rain / Snow Indication
Remote Access
High Accuracy
Alert Notification
History Export
Meross MS405 Smart Water Leak Sensor Main Features
– Sensitive and reliable probes on both the top and the bottom of the leak sensor ensure no leak escapes notice—whether it’s slow drips or sudden pipe bursts.
– Never miss an alert with our 100dB dual alarm system(Sensor and HUB), even in heavy sleep. With the automation feature, you can also set color-coded alerts—like red lights—to notice leaks immediately.
– 24/7 peace of mind, anywhere—receive real-time leak alerts via app notifications. All incidents are logged for 2 years with free timeline reviews and exportable records in the Meross app, perfect for insurance claims or maintenance tracking.
– Compatible with Apple Home, Alexa, Google Assistant and SmartThings. It is easy to integrate the leak sensor into your smart home systems.
– Built to Endure with an IP66-rated waterproof shell that survives leaks and floods. Powered by 2 AAA batteries (included and replaceable) with a life expectancy of over 3 years.
– 100-meter transmission range – The Meross hub with SubG 433 MHz wireless technology has stronger and more stable signal transmission than WiFi and ZigBee/thread range. The leak sensor can effectively monitor water leaks in the cellars, basements, laundry rooms, or under-sink installations.
Meross MS405 Smart Water Leak Sensor Specs
Brand: Meross
Model: MS405 / MS405HHK-EU V4.0
Type: Temperature and Humidity Smart Sensor
Smart Water Leak Sensor Input: 3V DC
Battery: 2 x 1.5V AAA Batteries (included), replaceable
Smart Hub Input: 5V 1A, 500mA min.
Alarm Volume: 100 dB
Dimensions(W x D x H): 63 x 63 x 27 mm
Smart Hub Wireless Standard: 802.11 b/g/n 2.4GHz Wi-Fi 433MHz
Smart Water Leak Sensor Wireless Standard: 433MHz
Water Leak Sensor FCC ID: 2AMUU-MS405
Water Leak Sensor IC: 24963-MS405
Smart Hub FCC ID: 2AMUU-MWA02
Smart Hub IC: 24963-MWA02
System Requirements: Smart phone running iOS 13 or later, Android 8.0 or later & Existing Wi-Fi network
Certifications: US – FCC / EU – CE, RoHS, WEEE
Operating Temperature: 0°C~40°C (32°F~104°F)
Storage Temperature: -20°C~50°C (-4°F~-58°F)
Operating Humidity: 10%~90% non-condensing
Storage Humidity: 5%~90% non-condensing
Dust & Water Proof: IP66
Water Leak Sensor Firmware version: 1.1.4
Smart Hub Firmware version: 4.5.27
Smart Hub hARDWARE version: 4.0.0
EAN: 6942349213595
Color: White
Versions: Kit Version (With Hub + US Power Adapter) / Kit Version (With Hub + EU Power Adapter) / Kit Version (With Hub + UK Power Adapter) / Kit Version (With Hub + AU Power Adapter)
Meross MS405 Smart Water Leak Sensor best-use scenarios
– Laundry Room Guardian. I placed the sensor behind my washing machine—an area notoriously hard to monitor. A few hours later, I simulated a slow leak by dripping water near it. Within 1 second, both the sensor and the hub blared a 100dB dual alarm. That’s loud enough to wake me up from a nap—and also got my dog’s attention. At the same time, I received an instant push notification on my phone, even though I was on a 4G connection miles away from home.
– Under-the-Sink Defense. Next test: under the kitchen sink. I mounted the sensor directly on the cabinet floor. A small water spill triggered the sensor immediately. I appreciated the top and bottom detection—because sometimes leaks don’t come from the ground but from a faulty pipe dripping overhead.
– Smart Home Automation. Thanks to Apple HomeKit compatibility, I created an automation: when the sensor detects a leak, a red smart bulb in my hallway starts flashing. It’s not just functional—it adds a cool visual alert that can’t be ignored. I also tested with Alexa and Google Assistant, and integration worked flawlessly. Voice queries like “Is there a water leak in the laundry room?” gave accurate real-time responses.
HomeKit Setup tips
– If you are setting up HomeKit device, please connect your smartphone or tablet to a 2.4 GHz Wi-Fi network and disable your VPN, if any. Ensure that your Wi-Fi is using WPA3/WPA2 since WPA3 only will lead to setup failure.
– Make sure your smart device is covered by strong Wi-Fi signal, which is not a hidden Wi-Fi name (SSID). A hidden Wi-Fi name (SSID) might not work when setting up.
– Meross HomeKit smart devices support iOS 13/ iPadOS 13 or later. It is recommended that you upgrade your iOS or iPadOS to the latest version before pairing with the smart device.(iOS only. Android users needs Android 6.0 or later)
– Upgrade the Meross app to the latest version and make sure you granted access permissions, such as location and local network, asked by the Meross app.
– Launch the Meross app and log in to your account, or if you are a new user, tap Sign up to create a new account.
– Relocation of the smart device does not require additional operations provided that it remains on the same network with strong Wi-Fi signal.
– If this is not the first time you’ve added this smart device, you’ll have to reset it before going any further.
– Deny Meross app to access Precise Loation and Local Network will lead to setup failure.
– If you have multiple Wi-Fi in your house, we recommend you to leave only one Wi-Fi on when you set up HomeKit. iPhone may connect to A Wi-Fi when initiating the HomeKit setup while end up with connecting to B Wi-Fi. The key is that this will lead to Homekit setup failure for sure since HomeKit requires iPhone to connect to the same Wi-Fi during the whole process.
Meross Android application
Meross application can help you set up and manage smart WiFi bulb, plug, switch, garage door opener, thermostat, air purifier, sensor, humidifier and so on. Meross app offers you special value that other platform apps can not offer such as in-app hardware guide and troubleshooting, in-app setup guide and dedicated troubleshooting, firmware update, cloud service maintenance notice, digital user manual, consumer forum, and new product release information.
With meross app, you can:
1. Turn on and off your devices remotely from anywhere with internet.
2. Set schedules and scenes for your devices so that they can run automatically as you wish.
3. Link your devices to your voice assistant platform.
4. Check and update your devices to the latest firmware.
5. Share great product experience with others and discuss about how to use products in Forum.
6. Find information about special offer and new product release.
Download Meross Android application latest version for free from Google Play Store or from App Store.
Package Content
1 x Meross MS405 Smart Water Leak Sensor
1 × Meross MSH400 Smart Hub
1 × Power Adapter model TEKA-UCA10EU 5V 1A
1 × USB Cable
1 x Multi-language User manual (EN / DE / PL)
1 x Packaging Box
Photo gallery full album here. Official webpage here. Read more here about Meross products.
About Meross. Creativity is thinking up new things; innovation is doing new things. Meross, founded in 2016 by a group of experts from leading companies such as Microsoft, Cisco, MediaTek, and TP-Link, is replete with both first-class creativity and cutting-edge innovation. At Meross, we create products that empower people’s lives. We believe in making homes smarter and people’s lives easier. We believe everyone deserves a smart life, and it should be simple, smart, and stable. Meross has strong research and development capabilities, excellent operating experiences and solid partnerships with pertinent players in the industry, resulting in bountiful financial support and escalated profit growth. Today, the company has expanded with its tentacles spread across millions of customers from over 20 countries and regions. The company has an assortment of top-tier gadgets, including smart plugs, smart bulbs, smart switches, smart surge protectors, smart garage door openers, and smart radiator thermostats. Meross products are compatible with Apple HomeKit, Amazon Alexa, Google Assistant, SmartThings.
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