They all float Georgie. And when you're down here, you'll float too

Is the battery replaceable ? If yes, what size battery does it require ?

Hi - Yes, the battery is replaceable. It's a 9-volt battery. But in my opinion, the Zircon Leak Alert alarm is better than the Honeywell. The Zircon has sensors that lie flat on the floor, as opposed to the Honeywell, which has sensors that are raised slightly above the floor. In fact, I tested the 2 alarms side-by-side and found that the Zircon's response time is faster than Honeywell's. (The Zircon also uses a 9-volt battery).

Is it water proof? Meaning if it is submerged in several inches of water can it be reused?

I'm not sure if that would ruin it or not. I didn't submerge mine, just set it in shallow water to make sure it would beep.

How long battery last?

The Honeywell Home RWD21 Water Leak Alarm requires a 9-volt battery and has a standby current of 5 to 10 uA. The alarm sounds for up to 24 hours (dependent upon battery life) when water is detected. Hope this helps!

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Resideo RWD21 Reusable Water Leak Alarm,White

Resideo RWD21 Reusable Water Leak Alarm,White

Product ID: 105654965

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Details

Colour
White
Brand
Resideo
Power source
Battery
Compatible devices
Devices with
Product dimensions
8.3L x 8.3W x

💧Detects water as shallow as 1/16"

🔋Powered by a single 9V alkaline battery

🔔85 dB loud audible alert

Description

💧 Stay ahead of water damage with smart, silent protection!

SIMPLE SETUP - Place in vulnerable spots—no wiring or complex installation needed
COMPACT DISCREET - Slim, floor-mount design fits under appliances and sinks effortlessly
LOUD AUDIBLE ALARM - 85 dB alert ensures you never miss a leak warning
EARLY LEAK DETECTION - Spot leaks before they become costly disasters
REUSABLE ECONOMICAL - Unlimited use for multiple home locations without replacement

The Resideo RWD21 is a compact, reusable water leak alarm that detects water as shallow as 1/16 inch and emits a loud 85 dB alert. Powered by a single 9V alkaline battery, it’s designed for easy floor placement in hard-to-monitor areas like behind appliances and under sinks, providing an economical and reliable early warning system to prevent costly water damage.

Specifications

Battery description	Alkaline
Number of batteries	1 9V batteries required.
Voltage	9 Volts
Control method	Remote
Noise level	85 dB
Mounting type	Floor Mount
Sensor technology	Contact Sensor
UPC	712411960599 085267769792 716080041368
Global Trade Identification Number	00085267769792
Manufacturer	Honeywell Home
Part Number	RWD21/A
Product Dimensions	13.97 x 3.49 x 18.42 cm; 90.72 g
Batteries	1 9V batteries required.
Item model number	RWD21
Size	Pack Of 1
Material	Plastic
Shape	Circular
Installation method	Free Standing
Item Package Quantity	1
Usage	Inside
Included Components	Water Leak Alarm
Batteries included?	No
Batteries Required?	Yes
Item Weight	90.7 g

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