Nest Protect, 2nd Generation, Smoke & Carbon Monoxide Alarm, Dual Sensor, Ionization, Photoelectric, Long Life Battery,Thinks, Speaks, & Alerts Your Phone, Speaks To Tell What's Wrong & Where, Sends Alerts To Your Phone In Case You Aren'tHome, Split Spectrum Detects Fast & Slow Burning Fires, Can See The Invisible, Poisonous Carbon Monoxide You Can't, UL Listed, Long Lasting Sensors Keep You Safe & Sound For Up To 10 Years, SIGNED RESELLER AGREEMENT IS REQUIRED TO ORDER.