Sonoff SenseGuard Indoor Siren – indoor siren with battery, USB‑C, Zigbee, white‑red (SNZB-09P)

The SONOFF SenseGuard Indoor Siren (SNZB-09P) is a Zigbee 3.0 indoor audible and visual alarm siren with a maximum sound level of up to 105 dB, 10 selectable alarm tones, and four volume levels. It can be used as an alarm and notification device in security and smart home automations, for example together with door/window, motion, presence, or water leak sensors.

The audible and visual alarms can be controlled independently, allowing sound only, red light only, or simultaneous sound and light indication. The alarm duration can be configured from 1 second to 15 minutes. The four volume levels correspond to approximately 75, 82, 93, and 105 dB sound pressure level at a distance of 1 metre.

The siren is primarily powered by a 5 V DC, 1 A USB-C power supply and also includes a built-in 600 mAh lithium backup battery. If USB power is lost, the device automatically switches to battery operation and remains online. According to the manufacturer, the battery can provide more than 300 days of standby operation in silent mode. Thanks to Zigbee 3.0 connectivity, it can be used in the SONOFF eWeLink system as well as supported Home Assistant and SmartThings Zigbee environments.

About SONOFF

SONOFF manufactures smart home devices, relay modules, energy meters, wall switches, Zigbee sensors, control panels, gateways, and various electrical installation accessories. Its product range includes devices using Wi-Fi, Zigbee, Matter, and LAN communication.

SONOFF devices are primarily built around the eWeLink platform, but many products can also be integrated with Home Assistant, Zigbee2MQTT, ZHA, SmartThings, Alexa, Google Home, and other smart home systems. In addition to residential smart home solutions, the manufacturer's range includes DIN rail-mounted devices, energy monitoring solutions, and products suitable for professional installations.

Key Product Features

• Up to 105 dB alarm: The siren has a maximum sound level of 105 dB at a distance of 1 metre.
• 10 alarm tones: Choose from 10 built-in alarm tones, allowing different sounds to be assigned to different events.
• Sensor-triggered alarms: When linked with door/window, water leak, presence, and other compatible sensors, an alarm can be triggered by detection events.
• Red visual alarm: The siren also includes a red alarm light that can be used as a visual notification.
• Dual power supply: Can operate from an external 5 V USB-C power source or from the built-in lithium backup battery. The manufacturer specifies more than 300 days of battery standby time in silent mode.

Smart Home Protocols and Platform Compatibility

• Zigbee 3.0: Uses IEEE 802.15.4-based Zigbee 3.0 communication. A compatible Zigbee gateway or coordinator is required for normal smart home functions.
• eWeLink: With a SONOFF Zigbee gateway, the siren, visual alarm, alarm tone, volume, and alarm duration can be controlled from the eWeLink app.
• SONOFF Zigbee gateways: The manufacturer lists ZBBridge-P, ZBBridge-U, NSPanel Pro, and iHost as recommended compatible gateways.
• Home Assistant: Can be integrated into Home Assistant using a SONOFF ZBDongle-series Zigbee adapter with ZHA or Zigbee2MQTT.
• Zigbee2MQTT: According to SONOFF's compatibility table, audible and visual alarm control, tone selection, volume, alarm duration, battery monitoring, tamper detection, automation, and OTA firmware updates are supported.
• ZHA: Can be used with the Home Assistant ZHA integration, although according to SONOFF's current documentation, a separate ZHA script is required for full functionality.
• Samsung SmartThings: Supported with the Aeotec Smart Home Hub V3. SONOFF provides a dedicated SmartThings driver for the SNZB-09P.
• Amazon Alexa: Alarm on/off control is supported through eWeLink cloud integration.
• Google Home: Alarm on/off control is supported through eWeLink cloud integration.
• IFTTT: With an eWeLink subscription, IFTTT integration can be used to turn the alarm on and off.

Smart Features

• Manual alarm: The alarm can be started and stopped directly from the eWeLink app.
• Four volume levels: The selectable volume levels correspond to approximately 75, 82, 93, and 105 dB sound pressure level at a distance of 1 metre.
• 10 selectable tones: Different built-in alarm tones can be selected for different events. Uploading custom audio files is not supported.
• Adjustable alarm duration: Alarm duration can be configured from 1 second to 15 minutes.
• Independent sound and light control: Sound only, flashing light only, or simultaneous sound and light indication can be selected.
• Automations: Alarm events, device removal, external power loss, and offline status can be used as automation conditions.
• Configurable alarm action: Volume, alarm tone, duration, and visual indication can be configured as part of an automation.
• Tamper detection: The device can detect when it is removed from its mounting position. This event can be used as an automation condition and can also trigger a notification.
• External power monitoring: Loss of USB power can be detected and linked to push notifications.
• Battery level: When battery operation is selected, the current battery level can be displayed.
• Alarm history: Previous alarm events can be viewed in the eWeLink app.
• Device sharing: Control of the siren can be shared with other eWeLink accounts.
• OTA firmware update: Supported through eWeLink and, according to the manufacturer's compatibility table, through Home Assistant ZHA/Zigbee2MQTT. OTA updates are not supported through SmartThings.

Power Supply and Alarm Functions

• External power supply: 5 V DC, 1 A.
• Power connector: USB Type-C.
• Backup power supply: Built-in 600 mAh lithium battery.
• Automatic switchover: If USB power is lost, the device automatically continues operating from the built-in battery.
• Battery charging: When USB power is restored, the built-in battery charges automatically.
• Battery standby time: The manufacturer specifies more than 300 days of operation in silent mode.
• Maximum volume: 105 dB at a distance of 1 metre.
• Volume levels: Four levels, approximately 75 / 82 / 93 / 105 dB at 1 metre.
• Number of alarm tones: 10 built-in tones.
• Alarm duration: Adjustable from 1 second to 15 minutes.
• Visual indication: Red alarm light that can be controlled independently from the audible alarm.

Technical Specifications

• Product series: SenseGuard
• Product name: SenseGuard Indoor Siren
• Model: SNZB-09P
• MCU: TLSR8656
• Input: 5 V DC, 1 A
• Power connector: USB Type-C
• Wireless connectivity: Zigbee 3.0, IEEE 802.15.4
• Communication range: Up to 100 m in an open environment
• Dimensions: 81 × 81 × 35 mm
• Colour: White
• Enclosure material: ABS
• Usage environment: Indoor
• Operating temperature: 0–45 °C
• Operating humidity: 0–90% relative humidity, non-condensing
• Certifications: CE, FCC, RoHS

Additional Features

• Wall mounting: The removable mounting base can be fixed to the wall with screws or 3M adhesive.
• Communication range check: A short press of the pairing button can be used to check whether the siren is within suitable Zigbee communication range of the network gateway or router device.
• Battery-mode power button: The separate power button controls device power only during backup battery operation; it has no effect while USB power is connected.
• Factory reset: Press and hold the device button for 10 seconds to restore factory settings.
• Pairing mode: The device automatically enters pairing mode when first powered on. If pairing is not completed within three minutes, pairing mode can be restarted by pressing and holding the button for five seconds.