Universal Security Instruments Value Pack Universal Smoke Sensing Smoke and Fire Alarm MDS300-401 + Plug-in CO and Natural Gas Alarm MCND401

  • Universal Security Instruments Value Pack Universal Smoke Sensing Smoke and Fire Alarm MDS300-401 + Plug-in CO and Natural Gas Alarm MCND401
4-in-1 Protection Value Pack

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  • Universal Smoke Sensing Smoke and Fire Alarm + Plug-in Carbon Monoxide and Natural Gas Alarm
  • 4-in-1 Protection with 2 Installations
  • Revolutionary Universal Smoke Sensing Technology
  • Responds 87% Faster to Slow Smoldering Fires
  • Responds Quickest to Fast Flaming Fires
  • Self-Diagnostics Check
  • Sensitivity Adjustment
  • End of Service Life Warning
  • Plug-in CO and Natural Gas Alarm
  • Compact Plug-in-Design covers 1 Outlet
  • Digital Display Screen
  • 3 LED Colors Display Status of the Alarm, Power, CO and Gas
  • Ideal for Houses, Apartments and Mobile Homes
The Universal Security Instruments MDS300-401 Value Pack is a 4-in-1 combo pack that provides quadruple the protection with only two installations. This set comes with (1) MDS300 Smoke and Fire Alarm and (1) MCND401 Plug-In Carbon Monoxide and Natural Gas Smart Alarm to protect your family against four deadly household threats: fast-flaming fires, slow-smoldering fires, carbon monoxide and natural gas (or methane). Perfect for new or replacement installations, both alarms are suitable for houses, apartments and mobile homes. The MDS300 features Universal Smoke Sensing Technology to respond 87-percent faster to slow smoldering fires and respond quickest to fast-flaming fires. This alarm has additional features including a self-diagnostics check, a sensitivity adjustment for changes in temperature or humidity and an end-of-service life warning that sounds when it's time to replace the battery.

The MCND401 features a compact plug-in design that covers only (1) outlet for a fast and easy installation with no wiring required. This alarm has a digital display screen that provides carbon monoxide PPM (parts per million) levels and displays 'GAS' during an occurrence. Peak CO levels are recorded with the memory button and (3) LED colors display the status of the alarm, power, CO and gas. Both alarms come with a 9-volt alkaline battery that operates the alarm and continues protection in the event of a power outage. This alarm is ETL Listed to UL Standard 2034 & UL1484 and Federal Housing Authority (FHA) approved to exceed industry standards. For maximum protection, install an alarm inside every bedroom, outside every sleeping area and on all levels of the dwelling.
  • MPN: MDS300-401
  • UPC: 042741403009
  • Warranty: 10 year Limited and 5 year Limited
  • Alarms Power Source: 120 volt (plug In & battery backup)
  • Alarm Sensor Type: Universal Smoke Sensing Technology (Ionization & Photoelectric)
  • Manufacturing Credits: ISO 9001 certified factory, UL listed & CSFM listed
Q: WHY DOES MY SMOKE ALARM 'CHIRP' APPROXIMATELY ONCE EVERY MINUTE?
A: The smoke alarm chirps to indicate a "low battery" condition, meaning the battery needs to be replaced. Battery powered smoke alarms will chirp a minimum of 30 days before the battery completely loses power.

AC powered smoke alarms with battery backup will chirp indefinitely assuming AC power is present; if battery power is low, or battery is removed; until a fresh battery is installed. Approved replacement batteries are listed on the back of each smoke alarm and in the user's manual.

Certain model smoke alarms with a silence button (designed to silence the alarm during a nuisance alarm) may chirp to indicate the smoke alarm is in the silence mode. The chirp will stop after approximately 8 minutes and the smoke alarm will return to its normal operation.




Q: WHAT DOES IT MEAN WHEN THE RED LIGHT ON THE ALARM FLASHES APPROXIMATELY ONCE EVERY MINUTE?
A: The flashing red light gives a visual indication that the smoke detector is functioning properly. It also indicates a working battery is connected to the smoke alarm.




Q: WHAT DOES THE CONTINUOUS GREEN LIGHT ON MY SMOKE ALARM INDICATE?
A: When a green light is present on your smoke detector, it means that AC power is currently operating the alarm.




Q: THE GREEN LIGHT ON MY SMOKE ALARM HAS GONE OUT, WHAT DOES THIS MEAN?
A: If the green light on your smoke detector is not on, it means the AC power has been interrupted to the alarm. Check the circuit breaker and AC wiring to make sure power is still reaching the smoke alarm.




Q: HOW CAN I TELL WHICH SMOKE ALARM IN A MULTI-STATION SYSTEM INITIATED THE ALARM?
A: When interconnected alarms are alarming, the smoke alarm which initiated the alarm, either by test button or sensing smoke, will flash the red LED light approximately once per second. The red LED light on the other non-initiated interconnected smoke detectors will not be lit but will sound the alarm.




Q: HOW MANY SMOKE ALARMS OR DEVICES CAN BE INTERCONNECT AT ONE TIME?
A: The NFPA 72 standard states the interconnect limit is 12 smoke alarms and up to 6 other alarms (heat alarms or carbon monoxide detectors) for a total of 18 total alarms. With 18 alarms interconnected, up to an additional 6 relay modules may be interconnected (for a maximum of 24 devices).

If battery backup alarms and non-battery backup alarms and accessories are mixed in an interconnect system, all devices without battery backup WILL NOT operate during an AC power failure.

CAUTION: USI alarms and accessories should only be interconnected with other USI alarms and accessories. Connecting devices from another manufacturer to USI devices may result in nuisance alarms, failure to alarm, or damage to one or all of the devices in the interconnect system. All interconnected USI alarms should be powered by the same fuse or circuit breaker. Smoke alarms shall not receive their power from a circuit that is protected by a ground fault circuit interrupter. Improper connection will result in damage to the alarm, failure to operate, or a shock hazard.




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