Extremely loud 120 dB alarms help wake/alert homeowner or renter, helps deter intruder and possibly notifies neighbors, audible up to 750 feet (230 m) away. 3 adjustable settings (off/alarm/chime); chime mode is ideal to alert you when children or guests are coming and going when you are at home; no wiring needed, plus sensor mounts on either side of alarm. Superior to other home security products, this premium white alarm looks great inside your home. Alarm is secured by 4-digit PIN of your choosing with entry/exit delay setting; no key fob required. Provides battery status update with a low battery test button and low battery indicator; keypad door alarm requires three AAA batteries (not included), door/window alarm requires 4xLR44 batteries (included)