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Combination Alarms

The importance of installing a Combination Alarm that carries the additional bonus of deciphering threats brought on by a series of hazards such as Fire, Smoke, CO and Natural Gases cannot be understated. Universal Security Instruments understand the significance of outfitting your residence or place of business with a multi-purpose Alarm and has released a collection catered to the individual. Regardless of whether you're interested in protecting your home against CO and Natural Gas with the purchase of a Digital Display Plug-In 2-in-1 Carbon Monoxide and Gas Alarm, or looking for a premier defender in the Hardwired Universal Smoke Sensing Smart Alarm, USI has the ideal Combination Alarm to suit your every need.

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USI Electric Hardwired 3-in-1 Smoke, Carbon Monoxide and Natural Gas Alarm (MICN109)
3-in-1 | Battery Drawer | Silence
Your Price: $44.95     Save: $15.00
Availability: In Stock

USI 3-in-1 Hardwired Smoke, Fire & Carbon Monoxide Smart Alarm with 10 Year Tamper-Proof Sealed Battery (MIC1509S)
Hardwired with 10 Year Sealed Battery Backup | USST Smart Alarm
Your Price: $47.95     Save: $12.00
Availability: In Stock

USI Electric Hardwired 2-in-1 Carbon Monoxide and Natural Gas Smart Alarm with Battery Backup (MCN108)
2-in-1 CO + Natural Gas | Smart Alarm
Your Price: $34.95     Save: $10.00
Availability: In Stock

Universal Security Instruments Plug-In 2-in-1 Carbon Monoxide and Natural Gas Smart Alarm with Battery Backup (MCND401B)
Plug-In Alarm | Display Screen
Your Price: $39.95     Save: $10.00
Availability: On Order

USI Hallway 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm with 10 Year Tamper-Proof Sealed Battery (MIC3510SB)
10 Year Sealed Tamper-Proof Battery | USST Smart Alarm
Your Price: $42.95     Save: $17.00
Availability: In Stock

USI 4-in-1 Hardwired Universal Smoke Sensing Smart Alarm Smoke, Fire, CO and Natural Gas Detection (MDSCN111)
4-in-1 Alarm | Battery Drawer | Silence
Your Price: $59.95     Save: $20.00
Availability: In Stock

USI Hallway 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm with 10 Year Tamper-Proof Sealed Battery (MICH3510S)
10 Year Sealed Tamper-Proof Battery | USST Smart Alarm
Your Price: $42.95     Save: $17.00
Availability: In Stock

Universal Security Instruments Plug-In 2-in-1 Carbon Monoxide and Natural Gas Smart Alarm with Battery Backup (MCN400B)
2-in-1 Plug-In | Smarrt Alarm
Your Price: $32.95     Save: $17.00
Availability: In Stock

USI 10 Year Alarm Starter Kit, Smoke, Fire & Carbon Monoxide Bundle, Includes 2 Alarms
Bundle and Save - 3 Threat Protection
Your Price: $39.87     Save: $25.03
Availability: In Stock

USI Apartment/Condo Smoke, Fire & Carbon Monoxide Bundle, 6 Alarms for Full Room Coverage
Bundle and Save - Perfect for Apartment or Condo Owners
Your Price: $133.20     Save: $86.50
Availability: In Stock

USI First Floor Living Area, Smoke, Fire & Carbon Monoxide Bundle, Includes 3 Alarms
Bundle and Save - Perfect for 1 Floor Coverage
Your Price: $78.92     Save: $90.88
Availability: In Stock

USI Hallway 10 Year Tamper Proof Permanent Power Sealed Battery 2-in-1 Photoelectric Smoke & Carbon Monoxide Smart Alarm (MPC322SB)
Photoelectric | Sealed Battery Back-up
Your Price: $46.99     Save: $6.00
Availability: In Stock

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USI Combination Alarms come in a variety of models and employ various technologies to better recognize potential threats looming within your home or place of business. Due to their innate versatility, the following list has been composed to best represent each alarm's capabilities.


2-in-1 Combination CO and Natural Gas Alarm:

  • Digital Display Plug-In Carbon Monoxide and Natural Gas Smart Alarm with Battery Backup
  • Plug-In Carbon Monoxide and Natural Gas Smart Alarm with Battery Backup
  • Hardwired Carbon Monoxide and Natural Gas Smart Alarm with Battery Backup


  • 3-in-1 Combination Smoke, CO and Natural Gas Smart Alarm:

  • Hardwired Smoke, Carbon Monoxide and Natural Gas Alarm


  • 4-in-1 Combination Smoke, Fire, CO and Natural Gas Smart Alarm:

  • Hardwired Universal Smoke Sensing Smart Alarm with Smoke, Fire, CO and Natural Gas Detection

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