Product details:

Equipped with an ionization sensor this smoke alarm reliably detects smoke from fast-flaming fires and alerts you with an 85-decibel alarm. To ensure complete protection make sure to place one on each level of your home and in each bedroom. Can connect to other compatible BRK or First Alert smoke detectors to ensure all alarms will sound when smoke is detected. Simple to use with a single testsilence button and side-load battery compartment tamper-resistant locking brackets and universal mounting brackets make installation easy. Rigorously tested to meet UL standards.