Wirelessly interconnect alarms for your protection and peace of mind. This is a battery-operated wireless interconnect smoke alarm. Easily link up to 18 alarms together with the press of a button. When one alarm sounds, they all sound for maximum whole-home protection. With voice capability, these alarms can be programmed to tell you where the fire is located in your home. For example, "Hurry, evacuate! Smoke in master bedroom! Evacuate!" Photoelectric smoke sensor reduces false alarms from cooking smoke or shower steam. Easy access battery drawer; no need to remove alarm from ceiling to change battery. Wireless battery-operated smoke alarm meets UL standards. Recommended for people who are blind or hard of hearing as well as for children, who normally have trouble waking up to traditional smoke alarms. Package includes two smoke alarms and an instructional DVD. 10-year limited warranty.