LDG Electronics YT-100 Automatic Antenna Tuner 1.8-54 MHz, .1-125 Watts, 2 Year Warranty, Works with: FT-857/FT-897/FT-100 Series 1.8 to 54 MHz coverage (continuous coverage for MARS) - Tunes 4 to 800 ohms. (16 to 150 on 6M) RF Power: 1 to 100 watts SSB and CW, 30W on PSK. Built-in CAT interface for FT-100(D), 857(D) and 897(D) radios.* Powered from Yaesu radio over CAT port. SO-239 in and out connections for dipoles, verticals, beams, G5RV, OCF, Cobra, ect. Dimensions: 7.0L, 7.0W, 2.0H. Weight: 20 ounces - Includes 1 foot CAT interface cable.