When activated, Model STI-V34600 sends wireless radio signal to 4-channel voice receiver, which offers 10 tones/tunes and 53 selectable words in English or Spanish. Up to 4 tones/tunes or words can be programmed in sequence to identify which door requires assistance. Featuring 500 ft range (line of sight) between button and receiver, doorbell is supervised for low battery and signal reception and is both water- and weather-resistant for outdoor use.