This wireless door sensor entry alarm offers a simple and efficient way to monitor your home, office, or store. With a range of up to 1000 feet (300m) in open spaces, you can be sure you won't miss any visitors. The system is pre-paired, so there's no need for complex installation-just plug the receiver into a socket and use the provided double-sided adhesive to attach the sensor to your door. Setup is quick and easy.The system features 60 different chime options and five volume levels, from 0dB to 110dB, allowing you to adjust the sound to your preference. If you prefer silence, a discreet LED flash mode is available. The ultra-low power design ensures long-lasting performance, with the included 23A 12V battery lasting 1-3 years. To conserve battery life, the sensor includes a power button, allowing you to turn it off when not in use.Each door sensor is designed to have a unique chime for front and rear doors, helping you distinguish between different entrances. The system ensures that all receivers ring when a door is opened, but each door has its own distinct tone. For one-to-one sensor and receiver operation, the included instructions will guide you through pairing. This user-friendly system is perfect for home, business, and office use, providing reliable and customizable alerts.