AJ-938 UL Smoke and CO Combo Detector


  • Smoke and CO 2-in-1
  • 10 years battery life
  • UL217/UL2034 listed
  • Low battery warning
  • Easy installation
  • Loud 85db Buzzer
  • Aj-933
  • Aj-938
  • Aj-939
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1. 2 In 1 Combination Smoke/Carbon Monoxide Detector, can detect both smoke and carbon monoxide, combine two function in one device, reduce the cost

2. DC 3V bulit-in lithium battery with 10 years battery life, no need to cable connect, be convenient to install, also can save the battery cost and install cost

3. Big test button for easy recommended monthly testing, when you want to test the device, no need to take it off, just need a tool to press it.

4. ETL certification with UL 217/UL 2034 test standard, open the business door for USA and Canada market.

Three different designs with patent for your choose, which is Uniqueness. 

Additional information


Aj-933, Aj-938, Aj-939

technical parameter

Working voltageDC3V bulit-in lithium battery
Battery life10 years
standby current8.2uA
Working current﹤60mA
sound level85dB
Low battery threshold2.5±0.1V
Alarm modeSiren with flash(Buzzer & Red LED)
Detectsmoke and carbon monoxide
CO Alarm concentration:70ppm:60~240min
Gross weight0.295KG
product size135mm*35mm
Execute CriterionUL217 / UL2034


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