SwitchBot W4402000 3-Pack Wi-Fi Water Leak Detectors with 1m Cables

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Product guide

SwitchBot W4402000 3-Pack Wi-Fi Water Leak Detectors with 1m Cables

SwitchBot W4402000 water leak detectors are supplied as a three-pack with sensor cables. Each unit is described as connecting to 2.4GHz Wi-Fi for app and email alerts without a hub, alongside a local alarm. The listing’s battery details conflict, so confirm the selected pack’s battery contents and configuration before buying.

At a glance

Four sensor probes are claimed to detect water as low as 0.5mm, with a 1-metre probe cable for monitoring water levels in tighter or deeper placements.
The listing claims app and email notifications over 2.4GHz Wi-Fi without an additional hub, plus a local 100dB alarm.
The seller describes an IP67 waterproof shell and up to 24 months of battery life, subject to use and the listed battery configuration.

Price

£36.99Save 24%

Reference price: ~~£48.99~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

Three detectors with sensor cables can cover multiple leak-prone locations from one purchase.
Remote app and email alerts are claimed without buying a hub, and the units also have a local alarm.
The cable probe is intended to reach narrow spaces such as behind a washing machine or below a refrigerator.

Technical specifications

21 specifications

Identity
Brand	SwitchBot
Model	W4402000
Sensor technology	Contact Sensor

Connectivity and controls
Control method listed	App
Compatible devices	Smartphone, Tablet

Power and battery
Power configuration	Battery Powered
Battery description	Alkaline
Battery count listed	1 A batteries required. (included)
Voltage	3 Volts (DC)

Dimensions and installation
Mounting type listed	Tabletop Mount
Form factor	Detector with Cable (3 Pack)
Dimensions listed	5.9L x 2.5W x 5.9H centimetres
Weight listed	259 Grams
Colour	White

Detection and alerts
Low water detection claim	0.5mm
Cable length	1-meter
Alarm sound level	100 Decibels
Waterproof rating claim	IP67

Connectivity
Wi-Fi band claim	2.4Ghz Wi-fi & BLE
Hub requirement claim	no Hub needed

Battery life
Battery life claim	up to 24 months

What to know before buying

Listing details to confirm

Battery details are inconsistent: the product details specify one included A battery, while feature text says 2 x AAA batteries. The listing also describes a 1-metre extended probe and a three-pack, but does not clearly establish whether the cable length applies to each detector. Confirm the selected listing’s battery and cable configuration before purchase.

What’s in the box

Included

Water leak detectors with sensor cables (3)
AAA battery
User manual
Warranty card

Who is it for?

A good fit for

Households wanting to place leak sensors near sinks, appliances, water heaters or in basements and receive remote alerts.
Buyers who need a cable probe to reach a confined or water-level monitoring location.

Less suited to

Buyers who need a confirmed battery configuration before ordering without checking the selected listing.
Anyone whose Wi-Fi setup does not support the stated 2.4GHz band.

SwitchBot W4402000 3-Pack Wi-Fi Water Leak Detectors with 1m Cables · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 315 ratings

5 stars73%73%
4 stars15%15%
3 stars7%7%
2 stars3%3%
1 star2%2%

Customer feedback describes the detector as easy to set up and reports positive experiences with reliability, the loud alarm and app notifications, including notifications to multiple email addresses. Connectivity feedback is mixed. These reports are relevant if remote alerts are central to your setup, but they do not resolve whether a particular home’s Wi-Fi connection will be dependable. The product listing claims 2.4GHz Wi-Fi, app and email alerts, and a 100dB alarm.

Positive themes

Customers report easy setup, a loud alarm and useful app notifications.

Mixed feedback

Connectivity receives mixed customer feedback.

Frequently asked questions

Does the detector need a hub?

The listing claims that the detector connects to Wi-Fi for app and email alerts without an additional hub. It specifies 2.4GHz Wi-Fi.

What does the cable probe do?

The listing describes a 1-metre extended probe for monitoring water levels and reaching narrow spaces, including behind washing machines or beneath refrigerators.

Which batteries are included?

The listing conflicts: the product details say one included A battery, while feature text says 2 x AAA batteries. Check the selected listing to confirm the supplied battery configuration.

How loud is the local alarm?

The stated alarm level is 100 Decibels. The listing says it can be manually muted.