The recall involves Kidde TruSense Smoke Alarms & Combination Smoke/Carbon Monoxide Alarms. The recalled units are Kidde Model Series 2040, 2050, 2060 and 2070 Smoke & Combination Smoke/Carbon Monoxide alarms. Only alarms with the TruSense logo or “AMBER=FAULT” printed on the front of the alarm are included in this recall. The model number is printed on the back of the alarm.