Extended Wireless Range: Enjoy the convenience of a long-range wireless doorbell system with a reach of up to 300 meters, ensuring you never miss a visitor, whether you're in a large home or outside in the garden. Versatile Melody Selection: Customize your doorbell's ring with 38 different tunes, from traditional dings to pleasant melodies, suitable for various occasions and personal preferences. Easy Installation: Set up your doorbell in minutes with a simple wireless installation process that requires no complicated wiring or tools. Button: Power supply mode:12V 23A alkaline battery Transmitter power consumption:Less than 10mw (Spectrum analyzer antenna combination test, CE limit) Battery life: estimated 20 times per day, approximately 1-2 years Wireless distance:about 300 meters in open areas, 20-50 meters indoors with obstacles Working temperature:-20-60 Transmission frequency:433.92MHz Ring the bell: Power supply mode:AC100-240V 50HZ/60Hz Volume adjustment:8-level volume adjustment Music tuning:38 chord music pieces Volume range:25-85dB, tested at a distance of 0.5 meters with a decibel meter Working environment:humidity Less than 80% Working temperature:-10-60 Receiving frequency:433.92MHz Plug Type:US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Voltage:AC110-240V Due to different batches, there may be differences in product printed text, which will not affect use. Colour:Black Material:ABS Package Contents: 1 x Door Bell kit