System Sensor SpectrAlert Advance Mini-Horn 12/24Volt MHR, Red
Sound the alarm on any wall.
The System Sensor MHR is a red fire alarm notification appliance with high and low volume settings and temporal or non-temporal tones. It mounts to a single gang back box.

A fire alarm only helps if people hear it.
Notification appliances are how a fire alarm system tells occupants to act. The tone and volume need to suit the space and the system it connects to.
Flexible sound, compact mounting
The SpectrAlert Advance Mini-Horn is built around adjustable output and a low-profile footprint.
High and low volume
Offers high and low volume settings so the horn can be set for the application.

Volt operation
The MHR is listed as a 12/24Volt SpectrAlert Advance Mini-Horn.
Two tone choices
Supports temporal or non-temporal tones.
Single gang mounting
Mounts to a single gang back box, which suits aesthetically sensitive applications.
Sync and sounder compatibility
Compatible with the MDL sync module and mechanically and electrically compatible with PA400 series Mini-Alert sounders.
Everything you need to know.
| Brand | System Sensor |
| Model | Mini-Horn |
| Product type | Fire alarm notification appliance |
| Series | SpectrAlert Advance Mini-Horn |
| Voltage | 12/24Volt |
| Color | Red |
| Volume settings | High and low |
| Tones | Temporal or non-temporal |
| Operating temperature | 32 to 120 degrees Fahrenheit |
| Power supply | Regulated DC or full-wave rectified, unfiltered |
| Mounting | Single gang back box; ceiling or wall |
| Sync module | Compatible with MDL |
System Sensor SpectrAlert Advance Mini-Horn 12/24Volt MHR, Red
The System Sensor MHR is a fire alarm notification appliance: SpectrAlert Advance Mini-Horn 12/24Volt (Red). It is intended for fire alarm installers, integrators and facility maintenance teams who need a genuine System Sensor part for new installs, expansions or replacements.
Key Features
- Offers high and low volume settings, and temporal or non-temporal tones
- Can be mounted to single gang back boxes for aesthetically sensitive applications
- Operates between 32 and 120 degrees Fahrenheit from a regulated DC or full-wave rectified, unfiltered power supply
- Mounts to single gang back box
- Compatible with MDL sync module
- Mechanically and electrically compatible with PA400 series Mini-Alert™ sounders
- Listing for ceiling or wall mounting .
Specifications
- Brand: System Sensor
- Model: MHR
- Product Line: Select-Alert
- Product Model: MHR
- Product Series: MH
- Product Type: Horn
- Alarm Type: Audible
- Color: Red
- Depth: 0.5"
- Product Color: Red
- Width: 2.9"
- Input Voltage: 24V DC
- Input Voltage (V DC): 24
- Mount Type: Gang Box Mount
- Limited Warranty: 3 year
- Shipping weight: 0.32 lb
Typical Uses
- Audible and visible fire alarm notification
- Offices, schools, hotels, healthcare and other commercial buildings
Fire alarm devices must be installed and tested by qualified personnel in line with NFPA 72, local codes and the manufacturer's installation instructions. Please confirm that the MHR is compatible with your fire alarm control panel, wiring, voltage, mounting and finish before ordering. Contact us with the models of your existing devices if you need help checking compatibility.
Need help with compatibility?
Looking for a manufacturer part number, compatible replacement, or quantity order? Contact Raztechs for sourcing and quote support.

System Sensor Mini-Horn, ready to order.
- Product type: Fire alarm notification appliance
- Series: SpectrAlert Advance Mini-Horn
- Voltage: 12/24Volt
- Color: Red
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