AEGISLINK Interlinked Smoke Detector, Smoke Alarm with Replaceable Battery, Wireless Interconnected Smoke Alarm, S-RF500 (RF Interlinked, 6-Pack)Brand: AEGISLINK Color: White Features: This smoke detector comes with an extra long 10 year product life, keeping you and your family safe for a decade without the need for frequent replacements The alarms stay connected using radio frequency, so if one of them detects a threat in one room of the house, all will sound to quickly alert everyone in your home Connect up to 24 AEGISLINK wireless devices to fully protect your home, even across multiple