Data from Amazon and official Heiman and Netatmo sites.
2026 verdict
Which indoor siren scares harder? The Netatmo Smart Indoor Siren, at 110 dB against 95 dB, with vibration sensing and barking-dog presence simulation that the Heiman Smart Siren HS2WD series lacks.
It also runs on batteries rated for 2 years and sits on the lower price side. The catch is the ecosystem: it pairs only with a Netatmo Smart Indoor Camera over Bluetooth and lists no Alexa, Google Home, Apple Home, SmartThings or Home Assistant support. The Heiman Smart Siren HS2WD series is the opposite, a Zigbee siren that lists Alexa, SmartThings and Home Assistant, has a red LED and keeps sounding for about 12 hours after a power cut, but needs a Zigbee hub. Choose the Netatmo Smart Indoor Siren beside a Netatmo camera, and the Heiman Smart Siren HS2WD series for a Zigbee alarm build.
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Winner
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| Feature | Heiman Smart Siren HS2WD series | Netatmo Smart Indoor Siren | Winner |
|---|---|---|---|
| Battery Life | 12 hours | 2 years | Netatmo Smart Indoor Siren |
| Integrations | Alexa, Samsung SmartThings, Home Assistant | None | Heiman Smart Siren HS2WD series |
| Sensors | None | Vibration | Netatmo Smart Indoor Siren |
| Sound Level | 95 dB | 110 dB | Netatmo Smart Indoor Siren |
| Presence Simulation | NO | YES | Netatmo Smart Indoor Siren |
| Solar Charging | NO | NO | Tie |
| Connectivity | Zigbee | Bluetooth | Tie |
What the differences mean
Volume
The Netatmo Smart Indoor Siren is rated at 110 dB and the Heiman Smart Siren HS2WD series at 95 dB. That gap is audible in a hallway, though the Heiman is still unmissable in an indoor room.
How it connects
The Heiman needs a Zigbee hub and is driven by your automations. The Netatmo talks only to a Netatmo Smart Indoor Camera over Bluetooth, so it works as a same-room camera accessory rather than a general siren.
Smart home platforms
The Heiman lists Alexa, SmartThings and Home Assistant, though Alexa treats it as a plain switch. The Netatmo lists none of them, so a non-Netatmo household cannot fire it from another sensor.
Deterrence features
The Netatmo adds vibration sensing and presence simulation sounds. The Heiman has neither but has a red LED for a visual alarm, which the Netatmo does not.
Power
The Heiman is mains powered with a built-in battery for about 12 hours after a power cut. The Netatmo runs on 4 AA cells rated for 2 years, which suits a room with no outlet but means changing batteries.
Which one to buy if
- you already own a Netatmo Smart Indoor Camera
The Netatmo Smart Indoor Siren pairs with it and adds a 110 dB alarm and presence simulation in the same room.
- your alarm is built from Zigbee sensors in SmartThings or Home Assistant
The Heiman Smart Siren HS2WD series is a Zigbee device driven by automations, which the Netatmo cannot be.
- you want the siren to keep sounding through a power cut
The Heiman has a built-in battery rated for about 12 hours after mains power is lost.
- you want a dog bark or household noise to fool intruders
Only the Netatmo Smart Indoor Siren offers presence simulation sounds beyond a plain alarm tone.
$79.99
- + Integrations: Alexa, Samsung SmartThings, Home Assistant
- - Battery Life: 12 hours vs 2 years
- - Sensors: None vs Vibration
Winner
- + Battery Life: 2 years
- + Sensors: Vibration
- + Sound Level: 110 dB
- - Integrations: None vs Alexa, Samsung SmartThings, Home Assistant
What owners say
Netatmo Smart Indoor Siren owners who keep it close to their camera describe an alarm that is loud and effective, and several say it is strong enough to scare off an intruder. The barking and household-noise presence simulation gets singled out as more than a plain alarm tone, vibration sensing that spots deactivation attempts is valued, and app setup is quick when the two devices sit together. The recurring complaint is range: the Bluetooth link back to the camera drops unless the siren is very near it, which limits where it can go. Some owners received units that failed to pair or arrived faulty, and a few found support slow. Several wished it worked with HomeKit, since the camera it pairs with does, and note it cannot be triggered by hand.
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- Heiman Smart Siren HS2WD series
- Netatmo Smart Indoor Siren
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Frequently Asked Questions
Which is better overall: Heiman Smart Siren HS2WD series or Netatmo Smart Indoor Siren?
The Netatmo Smart Indoor Siren, for a home with a Netatmo camera: it is louder, has vibration sensing and presence simulation, and lasts 2 years on batteries. The Heiman Smart Siren HS2WD series is better for Zigbee and Home Assistant setups.
What is the biggest difference between the Heiman Smart Siren HS2WD series and the Netatmo Smart Indoor Siren?
What they connect to. The Heiman Smart Siren HS2WD series is a Zigbee siren that any hub automation can trigger, while the Netatmo Smart Indoor Siren only works with a Netatmo Smart Indoor Camera.
Which is louder, the Heiman Smart Siren HS2WD series or the Netatmo Smart Indoor Siren?
The Netatmo Smart Indoor Siren is rated at 110 dB, against 95 dB for the Heiman Smart Siren HS2WD series.
Does the Heiman Smart Siren HS2WD series work with Home Assistant or SmartThings like the Netatmo Smart Indoor Siren does not?
Yes. The Heiman Smart Siren HS2WD series lists SmartThings and Home Assistant through a Zigbee hub, while the Netatmo Smart Indoor Siren lists neither and is tied to its own camera.
Who should buy the Heiman Smart Siren HS2WD series?
People building a Zigbee alarm around SmartThings or Home Assistant who want a siren with a red light and a battery that carries it through a power cut.
Who should buy the Netatmo Smart Indoor Siren?
Owners of a Netatmo Smart Indoor Camera who want a louder, more deterring alarm in the same room, and can place the two close enough for the Bluetooth link.
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