USI Smoke Sensing Battery-Operated Smoke and Fire Alarms. Model MDS300 or MDS300L from $15.99–$22.99.

USI Smoke and Fire Alarms

Up to 36% Off
30+ bought
Discount 36%
Over 30 bought
$24.99
no longer available

Product Details


USI Battery-Operated Smoke and Fire Alarms

  • Model: MDS300 or MDS300L
  • Universal Smoke Sensing Technology for faster detection
  • Quickly responds to slow-smoldering and fast-flaming fires
  • Provides nuisance alarm protection
  • Battery-operated alarm provides continued protection in the event of a power outage
  • Self-diagnostics check to ensure proper operation
  • Sensitivity adjustment for changes in temperature or humidity
  • Provides 10 years of continuous protection and sounds when it is time to replace alarm
  • Quick activation pull-tab and front-loading battery drawer
  • Replace the battery without removing the alarm from bracket
  • Condition: new

MDS300
  • Powered by a 9-volt alkaline battery (included)
  • Dimensions: 2”x7”x10.38”
MDS300L
  • Powered by a 9-volt lithium battery (included)
  • Dimensions: 10” (W) x 7” (L) x 2” (H)

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The Fine Print


Free returns. Does not ship to AK/HI/Canada/Puerto Rico. Most orders are delivered within 12 business days from the purchase date. Does not ship to PO boxes. See return policy. Must pay applicable tax and provide name and shipping address at checkout, which will be shared to facilitate shipping. How is the strike-through price determined?

Customer Reviews

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USI Smoke Sensing Battery-Operated Smoke and Fire Alarms. Model MDS300 or MDS300L from $15.99–$22.99.

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