【150m/490ft Wireless Range】A strong and reliable signal ensures you never miss a visitor, even when you're in another room or on a different floor. Ideal for homes, offices, apartments, schools, villas, hotels, factories, hospitals, and classrooms. 【32 Chimes & 4 Volume Levels】Features 4 adjustable volume levels, ranging from 50dB to 100dB, with mute option. Choose from 32 clear and distinct melodies, including classic chime options. One receiver can pair with multiple push buttons, each可自定义设置. 【IP44 Waterproof & Weatherproof】Designed with IP44 rating for protection against dust and splashing water. Operates in temperatures from -10°C to 55°C. Resists rain, snow, and extreme weather conditions for reliable outdoor performance. 【LED Indicator with Mute Mode】Includes a visual LED flash alert for silent notification, ideal during meetings or naps. Suitable for households with sleeping children or noise-sensitive environments. 【Easy Installation & Energy Saving】Plug-in receiver requires no wiring. Mount the transmitter with included adhesive tape—no drilling required. Transmitter battery lasts over 2 years under normal use. Built-in memory retains settings after power loss.