Yaesu MLS-100 MOBILE SPEAKER FOR Yaesu FT-897, FT-450, FT-857, FT-817, FT-8800, FTM-3100, FTM-3200 and Vertex Standard EVX-5300, EVX-5400, VX-2100 RADIOS. Yaesu MLS-100 external loudspeaker is a high performance communications speaker matching the impedance and output requirements of most Yaesu and Vertex Standard transceivers. It mounts on a swivel stand that is supplied along with mounting screws and bolts. A 6.5 foot (2m) audio cable that terminates in a 3.5 mm mono mini plug is also supplied. 5.5 x 4.2 x 2.5 inches. Black plastic cased speaker and black metal mount. Impedance is 4 ohms and the maximum power input is 12 watts.