The K57FL miniature speakers have a flat design making them suitable for signal output in machines and other equipment where installation depth is limited. Waterproof. Plastic diaphragm (Mylar). Metal Basket. Connection using soldering points on rear side. Flat design Nominal Rated Power = 1W Impedance = 8Ohms Frequency Type = Mid Range Diameter = 57mm Driver Shape = Round Speaker Driver Size = 8 cm (3 in) and Under Cone/Dome Size = 57mm Cone/Dome Width = 57mm Frequency Response = 220 Hz - 16 kHz Waterproof = Yes