USI (3Pk) Hardwired 10Yr Backup Smoke Detector Photoelectric Sensor Voice Alert
10 YR BATTERY BACKUP. AND VOICE ALERT. PHOTO ELECRIC SENSOR. Tools, Plumbing, Faucets, And much more. Over 900 Ceiling Fixtures. Over 600 Wall Fixtures. Over 200 Ceiling Fans. Outdoor Lighting.