Strong Signal for Long RangeThis white waterproof wireless doorbell has 2 bells, penetrating wireless signal can be transmitted up to 300m in open space and long distance even with many obstacles(doors, walls) . You no longer miss any of your visitors. The chime does not interfere with other equipment in your home or your neighbors. 36 Melodies and 4-Level VolumeHigh quality speaker, adopt the most stable music chip, built-in 36 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 design and Smart LEDThe wireless transmitter made of superior material is IP44 standard waterproof, stable performance is guaranteed for outdoor use. thorough for the 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 included tape or screws. Without the hassle of cables.