You don't need to install an expensive security system to keep your home safe from burglars. The 105dB Motion Alert with Keypad is a battery-powered burglar alarm system that is set and disarmed with a user-programmable code. When in security mode, the burglar alarm's built-in PIR motion sensor triggers the 105dB alarm, an ultra-loud alarm that can frighten away even the bravest burglar. The 105dB Motion Alert with Keypad is powered by a single 9-volt battery, sold separately. The 105dB Motion Alert with Keypad is easy to install and use. Mount the burglar alarm in any convenient location using the included mounting materials. No wiring is required. Program your security code, which can be changed at any time. The PIR motion detector is set on a swiveling head, so you can mount it vertically or horizontally. With a 40-foot range at 110 degrees, it can easily capture any movement in a large room. You don't need to leave this burglar alarm armed when you're home. Set it to Enter Chime Mode, and it will beep briefly when someone passes through its motion detector. It also has a panic button for one-touch security alarm triggering. Additional features include a low-battery indicator. If you don't want to wait until the burglar is in your home before the alarm sounds, the 95dB Entrance Alert is a magnetic door alarm that emits a 95dB alarm when the door is opened. A 95dB Window Alert is also available. This glass-break sensor will alert you if anyone tries to tamper with your windows.