4" High Impedance Embedded Speaker Unit : 4" Full Range Speaker (8Ω3W) Band : 100Hz - 16KHz Impedance: 100V 3.3KΩ(3W) 5KΩ(2W) 10KΩ(1W) SIZ: Outside Diameter Diameter φ134mm x 83mm (inside wall) Front Thickness 1mm Ceiling Dimensions : φ10mm 8mm High Impedance This is a dancing embedded speaker. As a recessed speaker, it can be used as a flush mount to the ceiling or wall. Installation adjuster is included for easy installation.