As an AI language model, I don't have access to specific information regarding the carbon monoxide detectors used in duplex villas, as this depends on the preference of the building owner or developer. However, typically there are three types of carbon monoxide detectors available that can be used in a duplex villa:
1. Battery-operated carbon monoxide detectors - These are the most common type of detector that use batteries as the power source. They are easy to install and are relatively inexpensive.
2. Hardwired carbon monoxide detectors - These detectors are wired into the building's electrical system, with battery backups or directly connected to a central security system.
3. Combination smoke and carbon monoxide detectors - These detectors provide both smoke and carbon monoxide detection in one device. They are often recommended by building codes for new constructions.
It is important to note that whichever type of detector is used, it should meet safety standards and be placed in a location recommended by the manufacturer and local building codes.
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