Features: *Easy Installation: This wireless doorbell is designed for simple setup, allowing you to connect it to your home safety system without the hassle of complicated wiring, making it user-friendly for everyone. *38 ringtones: Choose from 38 different songs, play when the doorbell sounds, add personalized style to your family security, and the four -gear can be adjusted to meet different scenarios. *Weather-Resistant: Built to withstand harsh weather conditions, this doorbell features a waterproof design that ensures reliable operation during rain or snow, offering peace of mind throughout the year. *Long Range Transmission: The impressive transmission distance allows you to hear the doorbell from anywhere in your home, for ensure that whether you are upstairs or downstairs, you will never miss a visitor. *Multi-Purpose Functionality: exceed serving as a doorbell, it can also function as an call device for elderly family members, enhancing safety and providing an additional layer of protection in your household. Specifications: *Product Name:USB wireless doorbell *Material:ABS+PP *Size:Gatebell: 70*40*12mm, Ding Dong Machine: 60*60*20mm *Color:black *Volume: 4 -gear volume, maximum 85DB *Music: 38 songs *Lane length: 40cm *Working frequency: 433MHz *Transmission distance: 200M