Smoke Alarm, Low Profile, 9V Lithium Battery Powered, Photoelectric, Silence Feature, Tamper Resistant, Locks Alarm to Mounting Bracket to Prevent Removal of Battery and/or Alarm. BRK PR700 is a state of the art smoke alarm designed to provide early warning of a fire. It features a fully insect screened Photoelectric smoke sensing chamber, an 85dB horn, a supervised 9V battery power supply, a full function test switch, a silence feature to silence unwanted nuisance alarms, a red LED light that indicates...