SD Series 2 Wire smoke heat combo

• Two and four wire models
• Photoelectric smoke sensing technology
• Uses smoke sensor in conjunction with a fixed temperature heat sensor to extend reliability
• Durable sensor head, no need for replacement
• Remote LED output on select 2-wire models
• N/C (normal close) or N/O (normal open) selectable relay output
• Easy installation and maintenance
• Attractive sleek housing
• UL listed