General description This multifunctional wireless doorbell ensures you never miss a visitor, even in challenging environments. It operates effectively over a distance of up to 300 meters in open areas, making it suitable for various settings such as homes, offices, hotels, and warehouses. The doorbell features a compact design that does not occupy additional socket space. Technical specifications Operating distance: Up to 300m in open areas Volume levels: 4 adjustable levels from 0dB to 100dB Melodies: 36 built-in ringtones Operating temperature: -22°F to 158°F Material: High-quality ABS Installation Plug the receiver into a wall socket. Use the included bracelet to attach the battery transmitter to the outside wall. Simple installation process, manageable even for individuals living alone. Usage Press the transmitter to ring the doorbell. Blue light flashes when the button is pressed, aiding the hearing impaired. After a power outage, the doorbell retains the last melody and volume