Impressive 300-meter wireless range: Enjoy seamless connectivity with a range of up to 300 meters in open spaces. Easily install this versatile long-range wireless doorbell in your home, apartment or office, and expand your system with additional transmitters and receivers. Customizable Sound Options: Choose from 55 unique ringtones, including the nostalgic gong melody, with 5 adjustable volume levels up to 110 decibels. Easy Installation: Effortlessly install your doorbell using the provided double-sided tape or screws, providing flexibility and convenience for any installation. Reliable Memory Function: Built-in memory function retains settings even after a power outage, ensuring smooth operation. Safety First: The wireless doorbell is made of fireproof materials, safer and worry-free. RGB Light Design: RGB light design is more friendly to the hearing impaired and the elderly.