AVANTEK DT32 Wireless Doorbell Kit with 48 Melodies, 650ft Working Range Wireless doorbell kit, install battery-operated transmitter outside using adhesive mounting tape or screws, receiver chime unit plugs into the wall; maximum effective range 650 ft (200 m) Use as a residential or business doorbell, or home paging device; select from 48 tunes, from the standard ding dong to any several well-known and fun melodies; volume adjusts to 4 settings Blue LED flashes when someone is at the door; a specially designed coding system ensures no interference to or from any nearby wireless devices; super-efficient eco power management reduces power consumption Smart design and simple controls are designed for easy installation and operation; mounting the transmitter takes only a minute, this wireless door bell is ready to go out of the box; available in black or white color Door bell transmitter unit is weather, temperature, and water resistant (IP44) for optimal outdoor performance; quality design and materials for sturdy, dependable performance