The MINKEZ's MCS-840V is a ceiling speaker with a 70/100 volt transformer built in. The 70v/100v transformer approach decreases line losses over longer distances and allows several loudspeakers to be connected in parallel. This public address system with built-in 8"+1.5" coaxial speaker driver has a wide frequency response of 90-20kHz and a range of power outputs of 5W, 10W, 20W, and 40W to accommodate various room sizes. Besides, the power taps make it easy to convert the input from 100V to 70V or 8Ω, thus this speaker may be used with both high and low impedance inputs. The metal grille, ABS baffle, and ABS back cover are all coated in a pleasing white. It's an excellent choice for industrial and commercial applications such as background music and paging in hotels, malls and so on.