This value pack Includes 2 multi-purpose smoke alarms and one suitable for kitchen smoke alarm, 3/9 volt batteries (included), Test buttons and LED-verify alarm and battery operation, Easy-to-install - no wiring required, Hush button allows you to quickly silence nuisance alarms, Warning chirp sounds when smoke alarm battery needs replacement, Tamper-resist pin inhibits tampering with smoke alarms, Smoke alarms comply with the following authorities: Underwriters laboratories(UL) Federal housing authority (FHA) Housing and urban development (HUD) National fire protection association (NFPA) California state fire marshal Features: Hush button allows you to quickly silence nuisance alarms. Test Button and LED allow simple verification of battery and alarm opporation. Warning chirp sounds when smoke alarm battery needs replacement. Loud 85 decibel alarm warning. Mounting bracket allows for fast and easy installation Tamper-resist pin inhibits tampering with smoke alarms. 5 year limited warranty on alarms.