Volume and Tones

Around 100 to 105 dB fills a floor of a house. Multiple tones let you use softer chimes for “garage left open” and a loud siren only for real alarms.

Power Backup

A siren that runs on USB power with a backup battery, like the SONOFF SNZB-09P, keeps working if an intruder unplugs it or the power fails.

Hub Compatibility

Sirens and keypads use more complex Zigbee features than sensors, so support varies. Check that your hub (or Zigbee2MQTT / ZHA) supports the exact model before buying.

Arming and Disarming

An alarm needs a way to arm and disarm that doesn’t require a phone. Keypads with PIN codes or RFID tags make the system usable for the whole family.

Local Alarms

Sensors with built-in sirens alert anyone nearby even if the hub or internet is down. They’re the most reliable layer for leaks and tampering.

This generic Zigbee siren combines a loud alarm with a flashing strobe light and 18 selectable tones, controlled through the Tuya Smart / Smart Life app. The listing states a Tuya Zigbee hub is required, so it’s the natural choice for Tuya-based setups. Tuya sirens are often usable with Zigbee2MQTT too, but that isn’t promised by the seller. Ratings are mixed at about 3.4 stars from 160+ reviews.

Every alarm needs an easy way to arm and disarm. The frient Intelligent Keypad mounts by the door and lets family members disarm with a PIN code or tap an RFID tag, no phone required. It runs on standard AA batteries and needs a Zigbee hub; it’s popular in Home Assistant alarm panel setups. It averages about 4.4 stars from 130 ratings.

Stick THIRDREALITY’s vibration sensor on a window, safe, gun cabinet or mailbox and it detects knocks and tampering, then sounds its own 110 dB siren right where the action is. A mute switch lets you use it silently as a notification sensor instead. Two AAA batteries power it, and it has more than 600 ratings averaging about 4.1 stars. A 3-pack is also available.

Water damage is the most common home “alarm” event, and THIRDREALITY’s leak sensors handle it on their own. Each sensor sounds a 120 dB alarm the moment it detects water or drips, and also notifies your hub so you can trigger a siren or shut-off valve. Two AAA batteries last up to three years. The 4-pack averages about 4.4 stars. See our best Zigbee water leak sensors guide for more options.

frient’s Water Leak Detector is a Zigbee flood alarm with a loud built-in siren and instant hub notifications. Add frient’s separate probe to watch a second hard-to-reach spot while keeping the alarm unit where it’s easy to hear. It has about 21 ratings averaging 4 stars, so it’s less proven than THIRDREALITY’s sensors.

A cheap wireless button becomes a panic button with one automation: long-press to sound the siren, flash every light and send alerts. The SNZB-01P supports single, double and long presses, so the same button can also arm or disarm your system. It works with SONOFF bridges, Echo Zigbee hubs, SmartThings and Home Assistant and has nearly 1,000 ratings averaging about 4.2 stars. Mount one by the bed and one by the door.

THIRDREALITY’s Smart Button offers three actions (press, double press and hold) in a compact wireless body, and it pairs easily with Echo devices that have a built-in Zigbee hub. Use a hold to trigger an Alexa routine that sounds an alarm or announces “Help needed in the bedroom” on every Echo. It has more than 740 ratings averaging about 4.3 stars.

1. Pick a siren

The SONOFF SNZB-09P for most hubs, the Aqara Hub M2 for Aqara homes, or the Tuya siren for Tuya setups.

2. Add arming control

A frient Intelligent Keypad by the main door, or buttons for simple arm/disarm.

3. Cover entry points

Door sensors and motion sensors from our guides, plus a THIRDREALITY vibration sensor on vulnerable windows.

4. Guard against water

THIRDREALITY or frient leak sensors with built-in alarms.

5. Add panic buttons

SONOFF SNZB-01P or THIRDREALITY buttons by beds and doors.

6. Keep certified fire safety

Maintain your certified smoke and CO alarms; Zigbee sirens supplement them, never replace them.

Can I build a real alarm system with Zigbee?

You can build a capable DIY system: door and motion sensors detect intrusion, a siren sounds, a keypad arms and disarms, and your hub sends alerts. Home Assistant’s alarm panel, Hubitat Safety Monitor, SmartThings Home Monitor and Aqara’s alarm modes all handle the logic. What you won’t get is professional monitoring or automatic emergency dispatch unless you add a paid service.

Are there Zigbee smoke detectors?

Zigbee smoke and CO alarms exist in some markets, but they’re hard to find on Amazon US; the interconnected Heiman alarms sold there use Wi-Fi rather than Zigbee. For life safety, use certified interconnected smoke and CO alarms. You can still bring them into automations with a smart listener or relay, but don’t replace them with a smart siren.

Will my Zigbee siren work with Alexa?

It depends on the model. Echo Zigbee hubs support basic device types well, but sirens and keypads often appear with limited controls or not at all. For full siren features, use SmartThings, Hubitat, Home Assistant or the siren brand’s own gateway. Buttons and sensors with built-in alarms, like THIRDREALITY’s, work fine with Echo.

Where should I put a siren?

Place it high on a central wall or shelf, out of easy reach so an intruder can’t silence it quickly. A battery-backed siren like the SONOFF SNZB-09P keeps sounding even if someone pulls the cable. In larger homes, add a second siren upstairs so it can be heard in bedrooms.

How do I avoid false alarms?

Use entry delays so you can disarm after opening the door, tune vibration sensor sensitivity, keep motion sensors away from pets and heat sources, and start with soft chimes before switching to the full siren. Our best Zigbee motion sensors and best Zigbee door and window sensors guides cover reliable sensors for alarm use.