BRK PRC710B is a state of the art smoke and CO combination alarm designed to provide early warning of a fire or carbon monoxide danger. It features a photoelectric smoke sensing chamber, an electrochemical CO sensor and a sealed 10-year lithium power cell power supply that is permanently installed. The tamperproof design will not allow the powercell to be removed. The low power warning indicator will cause the alarm to “chirp” when it reaches the end of its service life and needs to be replaced. Upon end of life, the unit meets UL requirements for disabling the alarm and non-reinstallation of unit to mounting bracket. It also features a tamper resistant locking pin that locks the alarm to the mounting bracket to prevent removal of the alarm. Perfect for apartment, dormitory or hotel applications. The sleek, low profile design complements any décor. Designed for wall or ceiling mounting. Includes mounting anchors and screws.