General Description Our wireless doorbell's transmitter uses unique PUSH-RF technology, eliminating the need for batteries. It converts kinetic energy into an electrical signal, providing convenient and energy-saving operation. With 45 classic melodic ringtones and adjustable volume control, this model is perfect for any home. Technical Specifications Waterproof with IP44 rating, made from non-toxic and recyclable ABS Operating temperature: -20℃ to 65℃ Wireless range: Up to 150 meters Adjustable volume: 4 levels from 0dB to 90dB Compatibility and Included Accessories: 2 plug-in receivers Compatible with various environments: home, office, hotel, etc. Installation To install, simply attach the doorbell next to your door with the included double-sided tape or mount it on the wall with a screw. Then plug the receiver into an electrical outlet. Usage Enjoy pleasant melodies every time someone rings your doorbell. The LED indicator provides visual notification, perfect for the hearing impaired. Other Information This product is ideal for large homes and offices, ensuring you never miss a visitor, even in a large space.