Strong Signal for Long RangeThis waterproof wireless doorbell has 2 Transmitter & 1 Receivers, The penetrating wireless signal can be transmitted up to 300m in an 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. Waterproof and smart LED designThe wireless transmitter made of superior material is waterproof IP44 standard, stable performance is guaranteed for outdoor use. Blue LED on the button and receiver is a visual indication for host and visitor, it is also a fun and careful design for the hearing impaired. Visitors know if they have used the correct doorbell, because it lights up when used. 36 Melodies and 4-Level VolumeHigh quality speaker, adopt the chip of most stable music, built-in 36 melodies, Create clear and pure sound. Four volume levels adjustable from 25db to 85db. When the bell rings, you can easily hear it in the house. Memory function is available for sound and chime selection. Easy to InstallSimply plug the receiver into an outlet and attach the transmitter to the wall or door frame using the included adhesive tape or screws. Without the hassle of cables. Portable wireless doorbell kit with 300 meters range, with Blue LED alert and 36 melodious tunes at 4 adjustable volume levels, small DIY accessory to install in your home, office, hotel, farm etc. to provide you with greater security and convenience."