Door Alarms When Opened: This door alarm sensor will detect the door/window, and will be triggered to send out a signal when the door/window is opened. This home security door sensor chime when burglar opens door and helps deter break-ins Long-Range Wireless Door Alarm: The TECKNET wireless door alarm system features an ultra-long 350m (1148ft) range, ensuring the chime is heard throughout your home or office. It includes a vibrant RGB indicator that flashes with each alert, offering a clear visual cue designed for the hearing-impaired Customizable Chime & Volume: This smart door chime features 61 unique melodies and 5 adjustable volume levels (0–120 dB), which can switch to silent mode for undisturbed nights or quiet environments. A built-in memory feature recalls your last melody and volume after power cuts, so you never need to reconfigure settings Easy to Install: The door sensor and chime come pre-paired at the factory– just plug the receiver into a wall socket and stick the sensor on the door. Note: Take the battery isolation tab away before using the wireless door alarm, and switch on the door sensor to the "ON" position after installation Expandable Multi-Sensor Alarm: Every door and window sensor receiver can pair up to 20 door or window sensors. It is ideal for home, work, office, retail store ,factories, hospitals or business,etc. Each triggered sensor sends its own door chime so you always know exactly which door was opened What you get: You will get 1 x TECKNET Door alarm chime, 1 x magnetic sensor, 1 x Double-sided adhesives and 1x user Manual. We offer 36 months of support (registration required).For any enquiries, please feel free to contact TECKNET with 24/7 customer support, Manufacturer: TECKNET