Strong Signal for Long Range This white waterproof wireless doorbell has 2 doorbells, penetrating wireless signal can be transmitted up to 300m in open space and long distance even with many obstacles(doors, walls). You won't miss any of your visitors anymore. The chime does not interfere with other equipment in your home or your neighbors. 36 Melodies and 4-Levels Volume High quality speaker, adopt chip most stable music channel, 36 built-in melodies, Create clear and pure sound. Four adjustable volume levels from 25db to 85db. When the bell rings, you can easily hear it around the house. Memory function is available for sound and chime selection. Waterproof and smart design LEDUpper material wireless transmitter is waterproof to IP44 standard, stable performance is guaranteed for outdoor use. Blue LED on button and receiver is visual indication for guest and visitor, it is also fun and thoughtful design for hearing impaired. Visitors know they've used the right doorbell because it lights up when used. Easy to InstallJust plug the receiver into an outlet and attach the transmitter to the wall or door frame using the adhesive tape or screws provided.Without the hassle of cables. 100% Satisfaction Free Lifetime Technical Support and 12 Months After-sales Service.Any problems or questions, please feel free to contact us. Credibility and quality are our supremacy.