Two-way loudspeaker 15 W RMS, 100 V and low impedance (8 ohm). Power selection at 15, 7.5, 3.75 and 1.8 W. Complies with the EN 54-24 and BS-5839 voice alarm standards, part 8. Frequency response from 82 to 23,500 Hz. Sensitivity 91 dB (1 W, 1 m and 1 kHz). Maximum acoustic pressure 101 dB (15 W, 1 m and 1 kHz). Box dimensions 210 x 130 x 120 mm. Degree of protection IP65.