U.S. Patrol Instant Alarm Set - 4 Piece Door/Window Security

Protect yourself and your family with this instant alarm set. It's a set of 4 piercing 90-decibel alarms that deter intruders. Installs in seconds just peel & stick, no tools or wiring required. Each unit takes 3 AG10 button batteries which are already Installed and ready to be used.