General description No batteries are required for this innovative wireless doorbell, which utilizes unique PUSH-RF technology to convert kinetic energy into an electrical signal, allowing it to ring without the need for batteries. This energy-saving and practical design eliminates the worry of changing batteries, making it more convenient than traditional doorbells. The doorbell features 45 beautiful chimes and melodies, adjustable volume levels, and an LED indicator for visual notifications, making it suitable for various environments such as homes, offices, hotels, and more. Technical specifications Wireless range: 150M/500FT Volume levels: 4 adjustable levels from 0dB to 90dB Waterproof rating: IP44 Operating temperature: -20℃ to 65℃ Material: ABS (non-toxic, safe, and recyclable) Installation Stick the doorbell next to your door using the included double-sided tape or mount it on the wall with screws. Plug the receiver into a power outlet. Usage Ideal for large homes, warehouses,