The NetworX NX-208E Smoke Expander Module is an easy way to add up to 64 additional two-wire smoke detectors to the NX line of panels. The NX-208E has UL certifications for both residential and commercial fire applications when used with the appropriate NetworX control panel. In addition, each expander module has an optional tamper input, making it ideal for use in a remote location. It is ideal for applications where an integrated system provides the most comprehensive and cost-effective solution. With the NetworX NX-208E, you can now easily expand into the fire application market.