6.5'' ceiling speaker, 6 W (6, 3, 1.5 and 0.75 W selectable), 100 V, special VA (BS-5839, p.8, EN54). Sensitivity 93 dB and SPL max 100 dB (1 m, 1 kHz). Frequency response 140 ~ 20,000 Hz. Metal back cover, ceramic terminals, thermal fuse and internal fire resistant wiring. Dimensions 195 mm (diameter) x 75 mm (depth).