Smart Alarms, Sirens & Security Keypads
Indoor and outdoor sirens, alarm panels, and security keypads that arm, disarm, and announce your smart-home alarms.
About alarms & sirens
What is a smart alarm system?
A smart alarm system is built from three things working together:
- Detectors: motion, contact (door/window), glass-break, smoke, water (already covered under Sensors).
- Sirens: indoor and outdoor noisemakers that announce a triggered alarm.
- An alarm panel: the brain that holds armed/disarmed state, codes, modes (Home/Away/Night), and entry/exit delays.
The alarm panel is what stops your living-room motion sensor from triggering a 110 dB siren during the day. It's also what lets you arm "Night" mode that ignores upstairs motion but watches every door downstairs.
Which protocols do smart alarms use?
Sirens are usually Zigbee (Aqara FP1, Heiman HS2WD, Sonoff Zigbee siren) or Z-Wave (Aeotec Doorbell 6, Ecolink). They draw enough peak power that battery models are short-lived. Most users wire them or use rechargeable strobe sirens outdoors. Alarm panels and keypads run on Wi-Fi or Zigbee depending on vendor. Matter support for alarms is still emerging. Matter 1.4 introduced device types for boolean state and energy management, but alarm-specific clusters are still being standardized.
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Common use cases
- Sound the indoor siren when a contact sensor opens after the alarm is armed
- Flash a strobe siren outside when motion is detected after midnight
- Arm 'Night' mode automatically when the last person goes to bed
- Disarm the alarm via NFC tag or PIN keypad as you walk in
- Speak 'Front door opened' through a smart speaker instead of triggering a full alarm
Related categories
Frequently asked questions
Do I need a dedicated alarm panel, or can Home Assistant be the alarm?
Home Assistant has a built-in **Alarmo** integration that turns it into a fully featured alarm panel: arm/disarm modes, entry/exit delays, code support, and full automation triggers. For most DIY setups, this is plenty. Dedicated panels (Ring Alarm Pro, Abode, Konnected) make sense if you want professional monitoring or a UL-listed system for insurance discounts.
What's the difference between a piezo siren and a strobe siren?
A **piezo siren** is loud (90–110 dB). Designed to drive an intruder out and wake you up. A **strobe siren** adds a high-intensity flashing light to attract attention from outside. Outdoor sirens often combine both. Indoor sirens (Aqara, Heiman, Sonoff) are usually piezo only and run on Zigbee batteries.
Can smart sirens be triggered by other sensors?
Yes. That's the whole point. A siren is just a smart switch with extra dB. Any motion sensor, contact sensor, glass-break detector, or smoke alarm can fire it through your platform's automation engine. Most users keep the siren itself on a separate alarm-panel state machine so it only triggers when armed, not when the cat knocks something over at noon.
Do security keypads work with HomeKit, Google Home, or Alexa?
Few keypads expose to those ecosystems directly. Keypads are usually paired with their vendor alarm panel (Ring, Abode, Honeywell). Home Assistant plus Alarmo bridges the gap: a Zigbee keypad (Heiman, Frient, ThirdReality) arms/disarms HA's alarm, which then exposes the alarm state to HomeKit and Google via Matter.
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