Fangrui Product Details The Housing Is Made Of Materials That Are To Wear And Has A Stable And Reliable Performance. This Shortwave Automatic Antenna Tuner Can Be Used As Both A Shortwave Power Meter And A Standingwave Meter. The Minimum Starting Tuning Is 0.2w, And The Maximum Measurable Power Is 20w. It Works Effectively In A Wide Band From 1.8 To 30mhz. It Can Be Used In 20w Ssb Single Sideband Shortwave Devices. 1. Can Be Used As A Shortwave Power Meter Standing Wave Meter 2. The Maximum Measurable Power Is 20w. Minimum Start-up 0.2w 3. Can Be Used For 20w Ssb Single Sideband Shortwave Equipment. 4. Ft8, Cw, Fm, Am And Other Continuous Modes, 5.7 Group Lc Combination Version. 6. Frequency Of Use: 2-30mhz Extended Up To 54mhz Easy To Use Instructions: Turn On The Power And Built-in 3.7v1200mah Polymer Lithium Battery (charge With A 5v Charging Head When The Power Is Insufficient) Connect The Short Wave Machine To The Automatic Antenna Tuner In Radio Frequency Line, The Antenna Is Connected To The Ant (bnc Seat, Or Quick Soc