Acoustic projector with power rating of 20 W (selectable by switch to 10, 5 and 2.5 W). 5" bicone speaker. Frequency response of 120-20,000 Hz. Complies voice alarm BS-5839 and EN54. Sensitivity 93 dB (1 W, 1 m and 1 kHz). Maximum sound pressure level 106 dB (20 W, 1 m and 1 kHz). Narrow cylindrical enclosure. Finishing in white ABS (RAL9016) with aluminum grille and steel bracket. Suitable for outdoor (IP-66).