BOLLA BL-119 surface- mounted 6 -inch ceiling - mounted ceiling speaker semi-circular speaker background music public broadcasting speaker used in shopping malls, factories, supermarkets, restaurants, hotels, etc. Loudspeaker: 5.25 Rated voltage power: 100V, 10W Frequency Response: 130-18KHz Sensitivity: 90dB Exterior size (WLH) Exterior size; 195*55mm