The soundbox audio repeller emits an audible alert of your choice when motion is detected. Very effective to scare undesirable animals and to ward off intruders. The sound level can reach up to 85d with a maximum power of 25 watts. One default alert sound included (siren). Supports standard MP3 audio files. Detection range from 5 to 50 ft. Requires an SD/SDHC card up to 32 GB (not included)