Feature●4 Position Antenna Selector Switch●Built in Headphone Jack●4000 Watt Max●Frequency Range: 25-30 Mhz (10, 11 and 12 Meter Frequencies)●Measures Modulation Percentage, SWR, & SSB●Reads RMS & Peak Power●Large 4.5" Meter●4 Watt Ranges: 0 - 20, 0 - 200, 0 - 2000 and 0 - 4000Description Multifunction meter measures up to 4000 watts in four ranges 20, 200, 2000, 4000. Switch able peak & RMS power. SWR meter, modulation meter. Four position antenna switch, backlit meter display. Built-in phone jack for signal monitoring with included headphones.