A vintage U.S. Army Signal Corps loudspeaker model LS-166/U. Loudspeaker has a mounting bracket post to top. This is a standard magnetic speaker at 8 ohms at 3 watts. The speaker enclosure includes an 8:600 Ohm transformer to match the radio to the speaker. It has a switch located on the side to switch it between vehicle use and manpack. Cord is terminated at the end with a PJ-055B (.25 inch / 6.35mm) plug, measures: 120mm x 120mm x78mm (4.7" x 4.7" x 3").