BACKUP WARNING SIREN BU2000CW 12 to 24 Volt 112DB Reverse Motion Warning Alarm by Magnadyne Backup Warning Siren Water Proof Housing With Epoxy Embedded Electronics Power Input:12 to 24 Volt DC,output soundlevel :112dB Reverse Motion Warning Alarm Water Proof Backup Warning Siren 112dB Housing size: 4"(W) X 2 11/16"(H) X 1 5/8"(D) Ships From and Sold by CarAmpAndSpeaker