Features: This portable automatic antenna tuner compatible with QRP and QRO dual modes, so you do not need to buy a 5W antenna tuner and a 100W antenna tuner separately, save your money. The operating frequency is 3~30MHz, the theoretical design value is 1.8~54MHz, but depending on antenna type. Adopt PIC18F2520 microcontroller, which is faster and more efficient to use, give you a better using experience. Portable size and easy to use, you can take it with you to anywhere you want to use it. You can use external power supplys by using the power cord, which is convenient.