The Magituner comes in two formats, the A model which is used with random lengths of wire .Both models are rated at 400W CW or 550W PEP and are IP65 rated so can be used on marine vessels. The A model can be used with any length of wire >=8m. With an 8m length it will tune from 40m - 6m and at >=10m from 80m and up.