1. No Batteries Required: Our wireless doorbell transmitter utilizes specific technology. Pressing the button converts kinetic energy into an electrical signal to ring your doorbell wirelessly. It helps avoid battery concerns – being more convenient, energy-saving, and practical compared to older models. 2. 45 Beautiful Chimes & Melodies: Choose from 45 classic chime melodies with adjustable volume control and a diverse selection to meet your needs. There are 4 adjustable volume levels from 0dB to 90dB, which is loud enough for seniors to hear. The pleasant melodies can be enjoyed every time someone rings your doorbell. The LED indicator provides a visual notification, a useful feature for the hearing impaired. 3. IP44 Waterproof: The transmitter features an IP44 waterproof design, constructed from ABS, making it non-toxic, safe, and recyclable. It operates in temperatures ranging from -20℃ to 65℃ and can withstand various harsh weather conditions, including sun, rain, snow, and frost. It is widely used in homes, offices, hotels, villas, hospitals, study rooms, apartments, schools, and other suitable areas. 4. Long Wireless Range: With a 150M/500FT wireless range and 2 included plug-in receivers, this doorbell is unlikely to interfere with other devices in your home or your neighbors'. It helps ensure you never miss a visitor, even if you're a few rooms away or on a different floor. It is suitable for large homes, warehouses, offices, etc. 5. Easy to Use: Designed for convenience and ease of use, simply attach the doorbell next to your door using the included double-sided tape or mount the cover to the wall with a screw. Then, plug the receiver into a power outlet.