WIRELESS Magnetically triggered - No wiring is necessary ,alarm will sounds when window or door is opened by kids,elder & dementia or Burglars Super LOUD ALARM: Loud 120DB alarm sounds when door or window opens, helps deter intruder and alert residence Multi-purpose -- keep children away from cabinets, ground pool,Monitoring wandering, sleepwalking, elderly. ! Door window alarm deterring thieves effectively by loud alarm, also prevent children sneaking out the house without notice Simple peel and stick installation, package Includes everything you need when install. Came with LR44 batteries and adhesive tape. Door Open Alarms