The Philips Keypad-Controlled Door Alarm provides a simple-to-use, cost-effective security solution to protect you and your family against home invasions. Thanks to a reliable magnetic sensor and a 120-decibel alarm, a would-be intruder will think twice about entering through your door. Extremely user friendly, the door alarm features a 4-digit keypad for programming your custom pin. You can choose between instant or delayed chimes and alarms with the flip of an easy-access switch. AWAY mode gives you a 45-second window to exit your home after being armed. After getting home, enter your custom 4-digit code within 30-seconds to deactivate the alarm – great for eliminating any false triggers. For an instant alarm mode, simply select HOME. The uncomplicated wire-free design of the alarm is perfect for homes, apartments, dorm rooms and offices alike. Providing an extremely easy mounting process, use the included screws or double-sided tape to accommodate your installation preference. All you need to supply power to the alarm are 3 AAA batteries, which are available separately. Worried about running out of power. The battery test switch and low battery indicator will help you keep track of when to change them out.