4 Pack, Wireless, Window & Door Alarm, Alarm Sounds When Window Or Door Is Opened, 2 Sound Setting:120 dB Siren Or Chime By Using The Off/Chime/Alarm Switch, Can Be Attached To Windows, Doors, Sheds, Cabinets, Gates & More, Features Low Battery Test Button, Each Alarm Uses 4 Lr44 Batteries, Included.