General description No Batteries Required: Our wireless doorbell transmitter uses exclusive PUSH-RF technology, converting kinetic energy into an electrical signal that rings the doorbell wirelessly. This eliminates the need for batteries, making it more convenient, energy-saving, and practical than traditional models. The doorbell features an IP44 waterproof design, made of non-toxic, safe, and recyclable ABS, and can operate in temperatures ranging from -20°C to 65°C, ensuring functionality in various weather conditions. The LED temperature display shows the Celsius/Fahrenheit temperature when the receiver is not ringing, allowing it to double as an indoor thermometer. Technical specifications Wireless range: 150 m / 500 ft Temperature operating range: -20°C to 65°C Volume levels: 4 adjustable levels from 0 dB to 100 dB Number of ringtones: 38 Usage The doorbell is ideal for various environments including home, office, hotel, villa, hospital, studio, apartment, and school. It is