This antenna tune kit comes with the standing wave directions.Using a T-type topology network, shortwave 1-30MHz. It can withstand the transmit power of 15W.The tuning range of approximately 30-300 ohms. It is very convenient to install. It can be very convenient for QRP communication, to ensure high efficiency radio transceiver in communication, but also allows you to fully enjoy the fun of DIY. This kit welding comes with standing instructions,used to make transceiver and antenna effective match to meet your emission requirements, ensure efficient communication transceivers. Q9 type interface (such as the need to own M-type interface), using T-topology networks, shortwave 1-30MHz. Can withstand the transmit power of 15W, LED display tuning indication. 1x Antenna Tuner Kit Material:Electronic Component The number of days exposed to the straightening power: 20W Adjust the number of days for input power tuning: 3W Tuning instructions: LED display Interface: Q9 type Operating frequency: 1-30 MHz Antenna interface: Q9 type Antenna impedance matching range: approximately: 30-300 ohms Carrying RF power: less than 15W RF power required for tuning: less than 3W 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3.This kit is not a ready-made product, but you need to solder and install it yourself. Thanks for your understandings.