[Weatherproof performance]: This doorbell has IP44 dust and water resistance, and can operate perfectly in extreme climate conditions, including a temperature range from -4°F to 140°F (-20°C to 60°C). This ensures that the device can maintain optimal performance even in harsh environments. [3-in-1 design with LED indicator]: As a multi-functional 3-in-1 wireless doorbell, it not only provides basic doorbell functions, but also includes an LED indicator. This design has both auditory and visual notifications, ensuring that visitors can be effectively notified in any situation. [Dual USB Port Output]: The device features a unique design with two USB ports, with a total output power of 10W (5V/2A). This means that in addition to its main calling function, the doorbell can also serve as a charging station for user devices. [Volume and Ringtone Selection]: Users can flexibly adjust the volume from 0 to 110 decibels according to their preferences and environmental needs. There are 36 different ringtones and tunes to choose from, with a variety of personalized options to choose from. [Dual Plug-in Receivers and Extension Sockets]: Including two plug-in receivers and an additional extension socket, the setup ensures that the doorbell signal can be received at multiple locations in the home without occupying too many household power sockets. This design is not only convenient for users to install, but also convenient for connecting household appliances.