Live nowBlack Friday 2026November 20 to 30, 2026Starts in--d--h--m--sSee the deals

Image Slideshow Items

  • Eufy Indoor Siren E20
  • Eufy Indoor Siren E20 photo 2
  • Eufy Indoor Siren E20 photo 3
  • Eufy Indoor Siren E20 photo 4
  • Eufy Indoor Siren E20 photo 5
  • Eufy Indoor Siren E20 photo 6
  • Eufy Indoor Siren E20 photo 7
Last updated November 2026

Eufy Indoor Siren E20

A 110 dB plug-in siren with a battery backup that pairs in the eufy app in seconds, but only works if you already own a compatible HomeBase.

4.3
84 ratings

4.3 vs the 4.1 average of 7 sirens we track

28% OFF
$59.99
$42.99
As an Amazon Associate I earn from qualifying purchases
Launch Year: 2026

Model: T90R0121

Open selection
Works with
Connectivity
  • Wi-Fi 2.4 GHz
News by email

Not buying today? Get what's new by email

New releases and the smart home news worth knowing, in your inbox.

Smart home news and new releases, straight to your inbox

New releases, comparisons and the smart home news worth knowing.

No spam. Unsubscribe in one click.

Your subscription could not be saved. Please try again.
Please enter a valid email address.
Tick the box above to finish signing up.
We couldn't verify you're human. Please try again.
Too many attempts. Please try again in an hour.
Your subscription has been successful.
Our review

Eufy Indoor Siren E20 Review: A Loud, Easy HomeBase Add-On for Reaching Other Floors

The verdict

The Eufy Indoor Siren E20 is a companion siren for an existing eufy HomeBase system, not a standalone alarm. Owners mostly call it loud, easy to set up in the eufy app and a practical way to carry the alarm to a second floor or a bedroom, and the plug-in design with a battery backup removes battery chores. The catches are that it needs a compatible HomeBase, it must stay plugged in, a few owners found it less loud than they wanted, and some had trouble pairing or getting notifications on particular HomeBase models. It is a good add-on for eufy owners and a non-starter for everyone else.

Best for
  • Existing eufy HomeBase owners
  • Multi-floor homes needing louder alarm coverage
  • Bedroom alarm coverage
  • Indoor, plug-in installs

Pros

  • Loud 110 dB alarm that owners say carries through floors and doors
  • Quick pairing in the eufy app with a HomeBase
  • Plug-in power with a built-in battery that backs it up for up to 48 hours
  • Four volume settings in the app, including mute
  • Triggered by eufy motion sensors, door and window sensors and panic buttons
  • Home Assistant support through the community eufy-security-client integration

Cons

  • Needs a compatible eufy HomeBase to work at all, and some owners hit pairing or notification trouble
  • A few owners find it too quiet to wake them at night
  • Must stay plugged in, since the battery is only a backup
  • Indoor use only, with no weather resistance
  • No Alexa, Google Home, Apple HomeKit, SmartThings or Matter support
  • No vibration or tamper sensor

Who is the Eufy Indoor Siren E20 for?

The E20 is built for households already inside the eufy Security ecosystem. It connects over a sub-1GHz link to a HomeBase (Mini, 2, 3 or Pro) rather than to your router, and the HomeBase is what links it to the app and to your other eufy sensors and cameras. Owners typically add it to reach a floor or room where the HomeBase's own alarm is not audible enough, such as a second story or a bedroom. Without a supported HomeBase there is nothing for the siren to pair with.

What owners like

Loudness is the most common praise, with owners saying it carries through closed doors and floors and is well worth the cost, and some buying several. Setup is described as quick and painless: it appears in the eufy app within moments, and one owner mounted it with the adhesive strip without drilling. Owners like that it plugs in, so there is no battery to maintain, while the built-in battery keeps it working for up to 48 hours in a power cut. The app offers four volume settings, from mute to a 110 dB high, and the siren can be triggered from motion sensors, door and window sensors and panic buttons through eufy security modes and automations. Home Assistant can reach it through the community eufy-security-client integration with basic functionality.

What to know before you buy

The biggest caveat is that the E20 needs a compatible HomeBase to work at all. Some owners had a hard time: one could not get it to work on a newer HomeBase even after a replacement, and another using a professional-grade base found it did not provide the notifications they wanted. A few owners call it only moderately loud, or too quiet to wake them at night, while others call it very loud, so volume expectations vary. It is wired by design with only a backup battery, which a reviewer who liked the older battery-powered model regrets, and one unit would not take a charge. It is indoor only, has no tamper or vibration sensor, and works only inside the eufy app: it has no Alexa, Google Home, Apple HomeKit, SmartThings or Matter support of its own.

Is the Eufy Indoor Siren E20 worth it?

For an existing eufy HomeBase household that wants the alarm to be heard on another floor, it is a simple, well-liked add-on. The main risk is compatibility with your particular HomeBase and the volume you actually need, so confirm your base is on the supported list and test it in the room where you want it to wake you. Buyers who need a standalone siren, support for other ecosystems or outdoor placement should look elsewhere.

Frequently asked questions

Does the Eufy Indoor Siren E20 work on its own?

No. It connects to a eufy HomeBase over a sub-1GHz link and is controlled through the eufy app, so it needs a compatible HomeBase to operate.

Which HomeBase models work with the Eufy Indoor Siren E20?

It works with the HomeBase Mini, 2, 3 and Pro. A few owners report trouble with particular bases, so check that your HomeBase is current before buying.

How loud is the Eufy Indoor Siren E20?

It is rated at 110 dB on its highest setting, and most owners call it very loud. The app also offers mute, low (60 dB) and medium (85 dB), measured at 10 cm.

Does the Eufy Indoor Siren E20 keep working during a power outage?

Yes. It runs from a Type-C 5V adapter and its built-in rechargeable battery provides up to 48 hours of backup during an outage.

Does the Eufy Indoor Siren E20 work with Alexa, Google Home or Apple HomeKit?

No. It is a HomeBase accessory that sounds from eufy alarm events and has no integration of its own with Alexa, Google Home, Apple HomeKit, SmartThings or Matter. It can be reached in Home Assistant through the community eufy-security-client integration.

Can the Eufy Indoor Siren E20 be used outdoors?

No, eufy states it is designed for indoor use only.

Company
Eufy logo

Eufy

4.3/ 5 avg ratingChina flagHeadquartered in China

Eufy, a brand of Anker, makes a wide range of smart home and security devices including robot vacuums, security cameras, video doorbells and smart locks. Eufy emphasizes local storage and subscription-free options for its cameras, appealing to privacy-conscious buyers. Its products integrate with Alexa and Google Home.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Weather Resistance

NO

eufy states the Indoor Siren E20 is designed for indoor use only.

Dimensions

3.2 × 3.2 × 1.6 in 81.3 × 81.3 × 41.3 mm

Weight

?

Wired

YES

Powered by a Type-C 5V/1A adapter with a 6.5 ft cable, plus a built-in rechargeable battery as backup.

Battery Type

Built-in Li, 800mAh, 3.7V

Battery Life

48 hours

The built-in battery provides up to 48 hours of backup during a power outage.

Solar Charging

NO

2.4 GHz WiFi

HomeBase required

Sub-1GHz link between the siren and the HomeBase, which provides the WiFi connection. Works with HomeBase Mini, 2, 3 and Pro.

5 GHz WiFi

NO

Bluetooth

NO

Z-Wave

NO

Zigbee

NO

Thread Protocol

NO

Other

NO

Google Home

NO

Alexa

NO

The siren is a HomeBase accessory: it sounds from eufy alarm events and is not published to Alexa as a device of its own.

Apple HomeKit

NO

Samsung SmartThings

NO

Home Assistant

YES

The community eufy-security-client integration (installed through HACS) lists this exact model (T90R0, Siren Sensor E20) with basic functionality.

Matter

NO

Vibration

NO

Tamper

NO

Tones

?

Sound Level

110 dB

Four volume settings selectable in the app: mute (0 dB), low (60 dB/10 cm), medium (85 dB/10 cm) and high (default 110 dB/10 cm).

Sound Duration

?

Voice Prompts

NO

Light Type

NO

Light Level

NO

Presence Simulation

NO

Automations

YES

Triggers from motion sensors, door/window sensors or panic buttons, and runs with eufy security modes and automations.

Local Control

?

Spotted something wrong on this page? Tell us and we will fix it.

Ask Chip

Got a question about the Eufy Indoor Siren E20?

I know its spec sheet, what owners say about it and the rest of the catalog. Ask me about compatibility, alternatives or how it stacks up.

AmazonOur store on AmazonShop our ideas on AmazonLists of the smart home setups we would put together ourselves, ready to add to your Amazon cart.Shop on Amazon
On sale now

More Sirens on sale

View all
Full comparison table

Compare the Eufy Indoor Siren E20 with the other 7 Sirens

All Sirens in the catalog in one table: filter by what you need, sort by price or rating, and see exactly where this one lands.

  • 7 other Sirens
  • 36 specs compared
  • 33 filters
Open the full comparison
Head to head

Eufy Indoor Siren E20 vs the competition

View all
Eufy

More from Eufy

View all