All 4-Wire
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System Sensor
SKU: SYSCO1224TR
System Sensor CO1224TR 1224 Volt, 6-Wire System-Monitored Round Carbon Monoxide Detector w/RealTest
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System Sensor
SKU: SYSCO1224T
System Sensor CO1224T 1224 Volt, 6-Wire System-Monitored Carbon Monoxide Detector w/RealTest US Only
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Macurco
SKU: MACCME1
Macurco CM-E1 Carbon Monoxide Monitor, Rectangle Housing
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