These Philips Personal Security Window/Door Alarms provide a simple-to-use, cost-effective security solution to protect you and your family. Thanks to reliable magnetic sensors and 120-decibel alarms, a would-be intruder will think twice about entering your home. This pair of user-friendly alarms will provide you with the extra coverage you need. You can also choose between alarm or chime modes with the flip of a switch. When installed and armed, the alarm will activate if the window or door is opened, alerting you and deterring unwanted visitors. The uncomplicated, wire-free design of these alarms are perfect for homes, apartments, dorm rooms and offices alike. Use the included double-sided mounting tape to attach them to your window or door of choice within minutes. Supply power to each alarm with four LR44 button batteries (included).

• Prolonged exposure to alarm
• Do not mix old and new or other
• Replace all batteries at the same
• Replace fully discharged