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Room Alert 3S Monitor


The Room Alert 3S is AVTECH’s most economical environment monitor with the smallest footprint in our Room Alert PRO line, offering the highest security features such as HTTPS, TLS, and SNMP v3. It monitors temperature, plus up to 2 more environment conditions of your choice.

When conditions exceed your thresholds, Room Alert notifies you right away so you can act quickly.

  • Send email and text messages right from the device.
  • Trigger the warning LEDs and siren sound on a Light Tower.
  • Pair with (or other compatible platforms) for even more alerting capabilities.

The Room Alert 3S connects to your network via Ethernet cable.

Room Alert 3S Monitor  $ 295.00


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Room Alert 3S Description

AVTECH’s Room Alert 3S boasts the security capabilities of our larger Room Alert PRO environment monitors, but with the smallest footprint and the lowest cost. This little powerhouse monitors your facility for temperature and up to two more environment conditions of your choice.

As part of our Room Alert PRO line, the Room Alert 3S features these secure protocols:

  • View the built-in web interface over HTTP or HTTPS.
  • Push data to your account over HTTPS.
  • Send alert notifications from the device over your TLS mail server.
  • Integrate the device into your preferred SNMP program over SNMP v3. (SNMP v1 traps and SNMP v2c also available)
  • Update your firmware with your authenticated username & password.

True to its compact form, the Room Alert 3S’s lone digital port does double-duty. It can take a sensor to read your environment or an adapter to act on it. With the Light Tower & Relay Adapter, you can respond to conditions like a rise in temperature by turning on your AC—and alerting staff in the immediate area with the red light and siren sound on a Light Tower!

Small and light, the Room Alert 3S can hang from a ceiling or on a wall with no special tools; it fits easily in telecom or wiring closets, server rack cabinets, and other locations where space is at a premium. Multiples of this unit be distributed across strategic locations of larger spaces to cover more ground.

Use Room Alert on its own or pair it with these powerful platforms!

  • Room Alert Manager
  • 3rd-party SNMP or JSON

Trigger alerts, reminders and “all-clears” in response to environmental thresholds that you set.

Receive alerts in the best format for you!

  • Email
  • Text message
  • Visual/audible signal
  • HTTP post
  • SNMP trap

View sensor readings on an easy-to-read web interface—over the Internet or on your local network.

Compile, graph and download historical sensor data to spot trends in your environment.

Power Room Alert by PoE or with included 5V power adapter.

Room Alert 3S Specifications



Internal temperature sensor

Condition monitored
Indoor ambient temperature
-40 to 185°F (-40 to 85°C)
+/- 2°C
Numeric values in Fahrenheit or Celsius

External sensor & accessory ports

1 digital sensor/accessory port (RJ-11)
1 switch sensor port (screw terminal block)

Power & connectivity ports

1 5V barrel-connector power jack
1 RJ-45 Ethernet port (PoE-enabled)

Power supply

AVTECH 5V power adapter (100/240 VAC, 50/60 Hz, RoHS)
or PoE (IEEE802.3af compliant)


0.875" (2.22 cm)
3.625" (9.21 cm)
1.75" (4.45 cm)


0.15 lbs (2.4 oz)

Operating tolerances

-40 to 185°F (-40 to 85°C)
5% - 85% RH, non-condensing
Do not place Room Alert monitors inside refrigerators/freezers—these are condensing environments.

Room Alert 3S Compatible Products

Compatible monitoring platforms

You may access your Room Alert 3S through the compatible platforms below. For more information, please see our FAQ, The Differences Between Room Alert Monitoring Platforms.

Room Alert's built-in web interface Account

Room Alert Link software

Room Alert Manager software

3rd-party off-the-shelf SNMP program

3rd-party custom HTTP/JSON application

Compatible sensors & accessories

Compatible sensors & accessories
Matching ports on this model


1 digital port

Any AVTECH switch sensor

Any 3rd-party device with open/closed dry contacts


1 switch port

Any AVTECH analog sensor

Any 3rd-party analog sensor that outputs 1 to 5 VDC


Add 1 analog port.

Here's how: Put a Digital Temperature & Analog Sensor in your device's built-in digital port.

3rd-party low-voltage electrical devices


Add 1 relay output port.

Here's how: Put a Light Tower & Relay Adapter in your device's built-in digital port.

Then add up to 4 more relay output ports.

Here's how: Put a Relay Switch in the Light Tower & Relay Adapter.


Add 1 compatible port.

Here's how: Put a Light Tower & Relay Adapter in your device's built-in digital port.

Compatible power adapters

Always use an AVTECH 5V power adapter with your Room Alert. Others will void your warranty and may damage your unit.

Room Alert 3S Standard Package

The Room Alert 3S connects to your network via Ethernet cable.

Package contents


Room Alert 3S environment monitor

+ AVTECH 5V power adapter

+ Ethernet cable (10' or 3.05 m)

$ 295.00

Room Alert Account special upgrade offers

free! $ 105.00 to $ 349.95

Your cost

$ 295.00

Shipping weight

0.86 lbs (13.76 oz) Shipping calculated at checkout

Room Alert Account

A Room Alert Account at the Base level is free for all Room Alert customers and never expires.

Special Room Alert Account Upgrade Offers

Log in to your Room Alert Account or contact your Product Specialist for details.

AVTECH reserves the right to change special offers at any time.

Room Alert 3S Support & Documentation

New to Room Alert 3S?

Get to know this small but powerful model!

Video introduction to Room Alert 3S

Start here for a brief overview of this model’s features.

Room Alert 3S planning worksheet

You’re ready for your next adventure—add external sensors for the conditions most important to you.

Not sure which model is right for you?

Video overview of Room Alert

Get a quick peek at our Room Alert models—there’s one that’s right for you.

Room Alert product tours

Take in more of the local scenery—we’ve got tours for each Room Alert.

Room Alert model comparison

Do a deeper dive into each Room Alert’s features & benefits.

Need more assistance before you purchase?

Request a quote online or contact our experienced Product Specialists for a free consultation!

Already have Room Alert 3S?

Know your stuff

User's guide & reference manual

Learn how to navigate and configure your Room Alert’s built-in web interface.

Room Alert FAQs

More questions? Our extensive collection of easy-to-read answers is sure to help.

Limited hardware warranty terms & conditions

tl;dr? In short:

  • Room Alert PRO monitors are covered for 3 years after purchase.
  • External sensors & accessories are covered for 90 days after purchase.

Treat it right

Firmware downloads

Keep your unit’s firmware up-to-date. You’ll have the latest features & fixes for the best experience.

How to update firmware on Room Alert monitors

Refer to this FAQ for step-by-step instructions.

Room Alert 3S firmware release notes

Want to know what’s new? Look here.

Need more assistance in setting up or using your products?

Visit our online support center or contact our expert Technical Support Specialists

Room Alert is Made in the USA, ships worldwide from our locations in the US and EU, and has been protecting facilities since 1988.