General description No battery is required for this plug-powered wireless doorbell chime, which utilizes unique PUSH-RF technology. When the button is pressed, kinetic energy is converted into an electrical signal, allowing the doorbell to ring wirelessly. This design eliminates the need for batteries, making it more practical and energy-saving compared to traditional doorbells. The doorbell kit includes 38 melodies and 4 volume levels, ensuring a pleasant experience for all users. Technical specifications Wireless range: 150M / 500FT Volume levels: 4 adjustable levels from 0dB to 100dB Operating temperature: -20℃ to 65℃ Waterproof rating: IP44 Other information LED temperature display screen shows Celsius/Fahrenheit when the receiver is not ringing Made of ABS material, which is non-toxic, safe, and recyclable Includes 2 plug-in receivers Ideal for various settings including home, office, hotel, hospital, and school