Overview: Test button & Led allow simple verification of battery & alarm operation Hush button means that you can quickly silence nuisance alarms Warning chirp sounds when smoke alarm battery needs replacement Photoelectric sensor Loud 85 Decibel alarm alerts you of danger Tamper-Resist Feature inhibits Tampering of Smoke Alarm Mounting Bracket Allows for fast & easy installation Mounting screws included No wiring Necessary Specification: Weight Approx:133.5g Size Approx:10 x 10 x 3.4