The Kenwood AT-130 external manual antenna tuner covers eight HF ham bands from 80 through 10 meters. The AT-130 is designed for base or mobile use. The SWR meter operates in Through or Matching modes. Input 50 ohms unbalanced. Output impedance is 20 to 300 ohms. Through power is 150W (120W on 80 meters). Insertion loss is less than 0.5 dB. Minimum power required 2W. Input and output connection: SO239. Ground connection is a wing nut. There is DC input jack on the rear panel if you wish to apply 12 VDC for meter illumination. Physical: 6 x 2.4 x 6.3 inches 3.5 lbs. (152x60x159mm 1.6kg).