ADVANCED WIRELESS TRANSCEIVER TECHNOLOGY: Our wireless doorbell is made of high-quality microchips, which can provide an impressive remote connection; it is simple to set up, just plug the mini receiver into the socket, and fix the transmitter on the wall; it will not interfere other devices. 32 MELODIES & 4 VOLUME&Mute: Stereo speakers provide rich and crisp sound; 4 adjustable volume levels, you can easily choose from 32 melodies, and people including the hearing impaired are easy to notice. WATERPROOF AND STURDY BUTTONS: Good materials can protect itself from higher temperatures and interference. waterproof and dustproof, can withstand all kinds of bad weather conditions, suitable for outdoor use. MEMORY FUNCTION: After the power is off, the track is restored to the first song, and the volume is restored to the loudest; the convenient and easy-to-use design enhances the user experience. WIDE RANGE OF APPLICATIONS: The perfect wireless doorbell kit is suitable for homes, apartments, schools, villas, offices, warehouses, hotels, factories, hospitals, etc. Size:M557 | Color:White