Feature: 1. Multiple Melody Options and Volume Control: This doorbell offers up to 38 different melodies, includes a mute flashing light option and four level volume control for various user preferences. 2. Temperature and Humidity Monitoring: The doorbell comes with a built in thermometer and hygrometer, allowing real time measurement of temperature in both Fahrenheit and Celsius. 3. Clear Digital Display: The doorbell kit features an ambient digital display design with a bright light PC board screen, enhancing visual enjoyment and user experience. 4. Easy Installation: The wireless doorbell provides a plug and play setup, simply plug the mini doorbell receiver into a socket and fix the button on the wall using the provided double sided tape. 5. Long Distance Transmission: The doorbell utilizes high frequency electronic technology and FM signal solution, offering up to 100M transmission distance and strong anti interference capability. Specification: Item Type: Wireless Doorbell Model: T295-BB Material: ABS Input Voltage of Receiver: 85-260V AC Transmitter Power Supply Method: Self generated Power (converting kinetic energy into electrical energy by pressing the button; no battery, can generate automatic power) Waterproof Rating: IP44 Waterproof Operating Temperature: 0°C-99°C Operating Humidity: 0-99% Operating Frequency: 433.92MHZ Song Melodies: 38 Volume: 4 level adjustment Temperature Display: Celsius Fahrenheit adjustable Time Display: 00:00. Package List: 1 x Receiver 1 x Transmitter 1 x User Manual