LDG Electronics Z-817 Automatic Antenna Tuner 1.8-54 MHz, 0.1-20 Watts, 2000 Memories, 2 Year Warranty RF Power 0.1 to 20 watts SSB and CW, 5 watts for digital modes. Battery operated 4 x 1.5V Alkaline AA (not included) - Dimensions: 5.1L, 4.7W, 1.7H. Weight: 9.3 ounces (without batteries). Built-in CAT port interface. CAT thru port for computer connection. 38400 baud. 2000 memories when used with FT-817 interface (200 memories for other radios) 1.8 to 54 MHz coverage (continuous coverage for MARS) Tunes 6 to 600 ohms (about 10:1 SWR range). 16 to 150 on 6M (about 3:1)