BS-1 Outdoor Battery Backup Siren with Flash (outdoor siren, outdoor bell box, outdoor sounder, garden siren, battery backup siren) - size: 270x193x100mm - highly resistant ABS housing, UV prevention - inside metal cover for double protection - magnetic dynamic sounders with 120 db at 1 m - positive/negative siren trigger - positive/negative flash trigger - battery backup - lens colors in red, blue, orange, white - 3 way tamper switch protection