• 120 V hardwire with a 9 V battery back-up feature (battery included)
• Dual-ionization technology
• Alarm-Pause® silencer feature
• Alarm source indicator
• Alarm and power test feature and LED's
• Interconnectable up to 18 units
• Tamper-resistant "Lock-it" key mounting hardware included
• Up to 30 days low battery warning
• Dimensions: 5.25" dia. x 1.5" thick
• 10-year limited warranty (battery excluded)
• Meets applicable standards, ULC listed

Model No. SD527
Mfg. No. SA379