BRK (9120B) Smoke Alarm 120V AC 60Hz Wire-In Smoke Alarm 9V Battery Backup BRK 9120B Smoke Alarm 120V AC 60Hz Wire-In Smoke Alarm 9V Battery Backup BRK has been the top choice of contractors in the commercial market for over 50 years. Marketed to builders, electrical contractors serving single family, multifamily, hotel/motel, RV and manufactured homes channels. The contractor-friendly product and packaging design sets the professional standard. Working smoke alarms cut the risk of dying in a home fire by 50%, and that's important because a home structure fire was reported every 86 seconds. The 9120B hardwire alarm works exceptionally well by using ionization sensor technology to detect fast flaming fires that spread quickly. About Us Welcome to Help! Resale, your go-to consignment shop where value meets quality. At Help! Resale, we're dedicated to providing you with an exceptional shopping experience, whether you're looking to find the best deals or consign your gently used items. Help Resale 7200 Fair Oaks Blvd Ste 120 Carmichael CA 95608 Business Hours : Monday-Friday: 9:00 am to 5:30 pm (PST) All product and company names are trademarks TM or registered trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. (description exceeds maximum possible length)